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Wednesday, 30 March 2011

Stacking of final shuttle solid rocket boosters underway

NEWSALERT: Wednesday, March 30, 2011 @ 1508 GMT
  The latest news from Spaceflight Now
Crew patches for Expeditions 28 and 29 are now available from our store.
The last-ever set of space shuttle solid-fuel rockets began taking shape
Tuesday evening as technicians started stacking the boosters that will
power Atlantis this summer.
Japan's HTV cargo craft plunged back to Earth overnight Tuesday with a
unique sensor designed to record the heated death throes of the throwaway
garbage-filled spaceship.
The six astronauts to fly Endeavour's final orbital voyage have jetted
into the Kennedy Space Center for this week's countdown dress rehearsal
with the space shuttle launch team.
Communications satellites for the Middle East and Africa are buttoned up
for blastoff Wednesday inside an Ariane 5 rocket. The 16-story booster is
scheduled to lift off at 2145 GMT (5:45 p.m. EDT) today from Kourou,
French Guiana.
The official mission patch for Endeavour's last scheduled flight, STS-134,
is now on sale in our store.
Good Clear Skies
Colin James Watling
Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)

Monday, 21 March 2011

SPA ENB No. 307

                 The SOCIETY for POPULAR ASTRONOMY
         Electronic News Bulletin No. 307     2011 March 20
 Here is the latest round-up of news from the Society for Popular
Astronomy.  The SPA is Britain's liveliest astronomical society, with
members all over the world.  We accept subscription payments online
at our secure site and can take credit and debit cards. You can join
or renew via a secure server or just see how much we have to offer by
By Andrew Robertson, SPA Planetary Section Director
Note: all altitude values and timings are given for my latitude of
52°.5 North and longitude 1°.5 East.
MARS, URANUS and NEPTUNE are unfavourably placed for observation.
VENUS has almost ended its brilliant morning apparition.  It is still
shining at mag -4 very low down in the ESE at dawn.  At the start of
civil twilight (when the Sun is 6° below the horizon) at 05:24 March 20
it is at an altitude of only 3°.  Similarly at 04:57 on March 31 it is
only 2° above the horizon.  During that period its phase increases
from 77% to 80% and its angular size diminishes from 14" to 13".
On March 31 it is just 5° directly below a thin crescent Moon.  That
is always a superb sight and it is worth trying to catch it.
SATURN is now well placed for observation, being due South on March 20
at 1am GMT at an altitude of 34°.  The rings are well displayed, being
tilted towards us at just over 10°.  Saturn is at opposition on April
4, being due South at 1am BST at an altitude of 35°.  It is going to
get progressively lower at successive oppositions over the next 7
years so make the most of this one.
JUPITER is an evening object just above the western horizon at dusk,
and like Venus is almost at the end of this apparition, but it is
directly below an excellent evening apparition of Mercury.
MERCURY has its most favourable evening apparition of the year this
month, being at Greatest Elongation East of 19° on March 23.  At the
end of civil twilight, varying from 1841 on March 20 to 1850 on March
25, it maintains an altitude of 11° above the horizon.  Throughout
that period Jupiter is directly below Mercury, at an altitude of 6° on
the 20th but only 1° on the 25th (i.e. 10° below Mercury).  It is
worth trying to catch elusive Mercury.  I would also be interested to
hear of any visual naked-eye sightings (I've only had a handful of
unaided sightings myself over the years).  From March 20 to 25 its
brightness diminishes from magnitude -0.6 to +0.2.
Any reports of observations would be most welcome via:
In 2008/9, sunspots almost completely disappeared for two years.
Solar activity dropped to hundred-year lows; the Earth's upper
atmosphere cooled and collapsed; the Sun's magnetic field weakened,
allowing cosmic rays to penetrate the Solar System in record numbers.
It was a big event, and solar physicists openly wondered where had
all the sunspots gone.  For years, solar physicists have hypothesized
about the Sun's 'Great Conveyor Belt'.  Plasma currents called
'meridional flows' (akin to ocean currents on the Earth) travel along
the Sun's surface, plunge inward around the poles, and pop up again
near the Sun's equator.  Those looping currents play a key role in the
11-year solar cycle.  When sunspots begin to decay, surface currents
sweep up their magnetic remains and pull them down inside the star;
300,000 km below the surface, the Sun's magnetic dynamo amplifies the
decaying magnetic fields.  Re-animated sunspots become buoyant and bob
up to the surface like corks in water - and a new solar cycle is born.
For the first time, astronomers believe that they have developed a
computer model that gets the physics right for all three aspects of
the process -- the magnetic dynamo, the conveyor belt, and the buoyant
evolution of sunspot magnetic fields.  According to the model, the
trouble with sunspots actually began in the late 1990s during the
upswing of Solar Cycle 23.  At that time, the conveyor belt sped up.
The fast-moving belt rapidly dragged sunspot corpses down to the Sun's
inner dynamo for amplification.  At first glance, that might seem to
boost sunspot production, but no, when the remains of old sunspots
reached the dynamo, they rode the belt through the amplification zone
too hastily for full re-animation, and sunspot production was stunted.
Later, in the 2000s, according to the model, the conveyor belt slowed
down again, allowing magnetic fields to spend more time in the
amplification zone, but the damage was already done.  New sunspots
were in short supply.  Adding insult to injury, the slow-moving belt
did little to assist re-animated sunspots on their journey back to the
surface, delaying the onset of Solar Cycle 24. The stage was set for
the deepest solar minimum in a century.
While a solar maximum is relatively brief, lasting a few years,
punctuated by episodes of violent flaring that are over in days, a
solar minimum can grind on for many years.  The famous Maunder Minimum
of the 17th century lasted 70 years and coincided with the deepest
part of Europe's Little Ice Age.  Researchers are still struggling to
understand the connection, but one thing is clear: during long minima,
strange things happen.  In 2008/9, the Sun's global magnetic field
weakened and the solar wind subsided.  Cosmic rays normally held at
bay by the Sun's magnetism surged into the inner Solar System so,
ironically, during the deepest solar minimum in a century, space
became a more dangerous place to travel.  At the same time, the
heating action of UV rays normally provided by sunspots was absent, so
the Earth's upper atmosphere began to cool and collapse.  The orbits
of space junk did not decay as rapidly as usual and the junk
accumulated in Earth orbit.
Impact craters are generally round because the projectiles that create
them penetrate far into the ground before the shock wave of the impact
can explode outward, but Mars Express has returned new images of an
elongated impact crater in Mars' southern hemisphere.  Located just
south of the 450-km Huygens basin, it could have been carved out by a
train of projectiles striking the planet at a shallow angle.  In that
area there are many impact scars, but perhaps none more intriguing
than the elongated craters.  One of them, at 21S/55E, measures 133
by 53 km.  The clue to why it is elongated comes from the surrounding
ejecta blanket, which is shaped like a butterfly's wings, with two
distinct lobes.  That hints that two projectiles, possibly halves of a
once-intact body, slammed into the surface.  In the crater itself,
there are three deeper areas that could be evidence for more than two
projectiles.  In addition, a second elongated crater lies to the
north-northwest.  It is in line with the first one, in agreement with
the notion that the structures were the result of a train of
projectiles.  In the early 1980s, scientists proposed that incoming
chains of orbital debris following trajectories that decayed with time
formed elongated impact craters.  As the debris spiralled downward, it
eventually struck the planet at shallow angles, gouging out the
elongated craters.  This particular ejecta blanket contains many
smaller craters, indicating that the original formed a relatively long
time ago and then itself became a target.
Optimists searching for life in outer space focus on those exoplanets
that are located in the 'habitable zone', meaning that they orbit
their sun at a distance where the temperatures on the planet's surface
allow for the presence of liquid water.  Water is believed to be an
essential ingredient for life.  Until now, the two main drivers
thought to determine a planet's temperature were the distance from the
star and the composition of the planet's atmosphere.  It has now
dawned on the enthusiasts, however, that tidal effects modify the
concept of the 'habitable zone' in three different ways.
First, tides can cause the axis of a planet`s rotation to become
perpendicular to its orbit in just a few million years.  Then there
would be no seasonal variations on such planets in the 'habitable
zones' of low-mass stars -- they would have huge temperature
differences between their poles, which would be in perpetual deep
freeze, and their hot equators which in the long run would evaporate
any atmosphere. The temperature difference would itself drive extreme
winds and storms.  The second effect of the tides would be to heat up
the planet, just as Jupiter's tidal heating of Io creates global
vulcanism.  Finally, tides can cause the rotational period of the
planet (the 'day') to synchronize with the orbital period (the
'year'), as has happened to our Moon, which only ever shows the Earth
one face.  As a result, one side of the planet receives extreme
radiation from the star while the other half freezes in eternal
darkness.  So the 'habitable zone' may well be uninhabitable!
Astronomers have applied the theory to GI581g, an exoplanet candidate
that has recently been claimed to be habitable.  They find that GI581g
should not experience any seasons and that its day is synchronized
with its year.  There probably would be no water on the planet's
surface, rendering it uninhabitable.  It seems that the chances for
life existing on exoplanets around low-mass stars, which have so far
been regarded as the most promising candidates for habitable
exoplanets, are pretty bleak.  It now seems that, if you want to find
a second Earth, you need to look for a second Sun.
Gamma-ray bursts (GRBs) are the most powerful blasts in the Universe,
and are thought to be created in the deaths of the most massive stars.
The brief flashes of gamma radiation are picked up by dedicated
satellites, which then send out alerts to the astronomers who study
them.  A GRB was found on 2010 March 16 by the Swift satellite, and
alerted the Gemini South telescope which found an associated supernova
in a galaxy 820 million light-years away.  X-ray radiation revealed
the explosion breaking out of the star, providing a much-needed
confirmation of the idea that GRBs are indeed linked with the
destruction of massive stars.
Astronomers have used various telescopes on the ground and in space to
discover and measure the distance to the most remote mature cluster of
galaxies yet found.  Although the cluster is seen as it was when the
Universe was less than one-quarter of its current age, it looks
surprisingly similar to present-day clusters.  Clusters of galaxies
are the largest structures in the Universe that are held together by
gravity.  Astronomers expect clusters to grow through time and, hence,
that massive clusters would be rare in the early Universe.  Although
even more distant clusters have been seen, they appear to be young
clusters in the process of formation and are not settled, mature
The international team used the Very Large Telescope (VLT) to measure
the distances to some of the blobs in a curious patch of faint red
objects first observed with the Spitzer space telescope.  The grouping
had all the hallmarks of being a remote cluster of galaxies.  The
results showed that it was indeed a galaxy cluster, viewed as it was
when the Universe was about 3 billion years old.  Once the team knew
the distance, they observed the component galaxies with the Space
Telescope and the VLT.  They found evidence suggesting that most
of the galaxies in the cluster were not forming stars, but were
composed of stars that were already about 1 billion years old.  That
makes the cluster a mature object, similar in mass to the Virgo
cluster, the nearest rich cluster to the Milky Way.  Further evidence
that it is a mature cluster comes from XMM-Newton observations of
X-rays from it.  They must be coming from a hot cloud of tenuous gas
filling the space between the galaxies and concentrated towards the
centre of the cluster.  That is another sign of a mature cluster of
galaxies held firmly together by its own gravity, as young clusters
have not had time to trap hot gas in that way.  If further
observations find many more such clusters, astronomers' ideas of the
early Universe will need to be revised.
The two Voyager spacecraft are travelling through a turbulent area
known as the heliosheath. The heliosheath is the outer shell of a
bubble created by the solar wind around our Solar System, a stream of
ions blowing radially outward from the Sun at a million miles per
hour.  The wind must turn as it approaches the outer edge of the
bubble where it makes contact with the interstellar wind, which
originates in the region between stars and blows past our solar
bubble.  In 2010 June, when Voyager 1 was about 17 billion km away
from the Sun, data from the low-energy charged-particle (LECP)
instrument began to show that the nett outward flow of the solar wind
was zero.  That zero reading has continued since.  The Voyager science
team thinks that the wind could not have disappeared in that area, but
must just have turned a corner, and it is of obvious interest to know
in which direction it has turned.
In order to find out, controllers had to change the orientation of
Voyager 1 so that the LECP instrument could act like a weather vane to
see which way the wind is now blowing.  Knowing the strength and
direction of the wind is useful towards understanding the shape of the
solar bubble and estimating how much farther it is to the edge of
interstellar space.  So on March 7 the spacecraft performed a
manoeuvre that it had not done for 21 years: it rolled 70 degrees from
its normal orientation, and held the position by spinning gyroscopes
for more than two hours.  (The previous time either of the two Voyager
spacecraft rolled and stopped in a gyro-controlled orientation was on
1990 Feb. 14, when Voyager 1 took a family portrait of the planets
strewn like tiny gems around the Sun
The scientists confirmed that the spacecraft had acquired the kind of
information they needed, and mission planners agreed to Voyager 1
doing more rolls and longer holds.  Five more such manoeuvres took
place over the next seven days, with the longest hold lasting nearly
four hours.  The Voyager team plans to execute a series of weekly
rolls for this purpose every three months.  The solar wind's outward
flow has not yet diminished to zero where Voyager 2 is exploring, but
that may happen as the spacecraft approaches the edge of the bubble in
the years ahead.
By Tony Markham, SPA Variable Star Section
The eclipse of Epsilon Aurigae, which started in the summer of 2009,
will soon be ending.  By analogy with the events during the previous
eclipse of 1982-84, the star will probably start to brighten during the
third week of March, with the eclipse being completely over by mid-May.
However, because the eclipsing object is believed to be a disc of
dusty material, rather than a star, there is no guarantee that its
dimensions have not changed in the intervening 27 years, so the
brightening could start several days earlier or later than predicted.
The next eclipse does not start until 2036, so the next couple of
months are your last opportunity for a very long time to see Epsilon
Aurigae eclipsed.  You can follow its brightening using this chart:
By Richard Bailey, Director, SPA Solar Section
Rotation Nos.  2106, 2107
The continuing adverse observing conditions again produced a much-
below-average number of reports, some correspondents being unable to
observe the Sun once.  From the meagre records received, the 8th had 3
small ARs on view plus a larger one, NH AR 1153, nearing the W limb.
Four ARs showed on the 12th, NH AR 1157 and 1159, SH 1156 and 1158.
On the 16th, SH AR 1158 was a line of spots, NH AR 1161 a cluster of
them.  NH ARs 1161 and 1162 were two close lines of good spots just
past the CM.  NH AR 1164 had come round the E limb on the 27th,
another good cluster.  Preceding it was small AR 1163 .  Extensive
faculae were seen to AR 1161 by the W limb on the 24th and to both
ARs on the 26th.  A feature noted during the month was the increasing
amount of penumbra to the stronger ARs.
MDF   1.93       R   29.54
When the Sun was viewable, several small prominences were visible each
time. On the 8th. a good NE hedgerow prominence stood out, also a SE
filament.  A strong NW filament showed on the 12th.  A flare was
observed at 09:10 on the 16th, and a long, strong dark filament near
the SW limb on the 10th; on the 24th a group in the E.  The 27th had
two strong prominences on the NE limb, one an arch, the other a double
tower shape.  A curving filament went E from NH AR 1164 by the E limb,
and the AR had strong plaging and small filaments.
MDF  3.50
Owing to holidays, the next bulletin will appear on April 10.
Bulletin compiled by Clive Down
(c) 2011 the Society for Popular Astronomy
Good Clear Skies
Colin James Watling
Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)

Super Perigee Moon

Super Perigee Moon
Sat, 19 Mar 2011 23:00:00 -0500

The full moon is seen as it rises near the Lincoln Memorial, Saturday, March 19, 2011, in Washington. The full moon tonight is called a super perigee moon since it is at its closest to Earth in 2011. The last full moon so big and close to Earth occurred in March 1993. Image Credit: NASA/Bill Ingalls 

NASA Questions? Contact Us

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Good Clear Skies
Colin James Watling
Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)

Soyuz capsule makes snowy landing with three-man crew

NEWSALERT: Wednesday, March 16, 2011 @ 1805 GMT
  The latest news from Spaceflight Now


Registration is now open for the Astronaut Scholarship Foundation's (ASF)
Spring Semi-Annual Auction of Astronaut Experiences & Memorabilia. The
online auction is comprised of 40 incredible lots of space artifacts and
adventures with astronauts. Bidding opens March 18; preview the catalog
and secure your virtual paddle number today.

Outgoing Expedition 26 commander Scott Kelly, Soyuz TMA-01M commander
Alexander Kaleri and flight engineer Oleg Skripochka undocked from the
International Space Station Wednesday, plunged back into the atmosphere
and descended to a snowy touchdown in Kazakhstan at 3:54 a.m. EDT to close
out 159-day mission.

Having already won the competition to launch one commercial Earth-imaging
satellite, the Atlas 5 rocket has been picked by the rival spacecraft
company to deploy its bird too.

Analysis of a pea-sized chunk of meteorite dating back to the dawn of the
Solar System provides the first evidence that dust particles bound up in
these ancient rocks are well-travelled and have experienced a range of

Images from satellites circling hundreds of miles above Earth show
widespread debris and flooded coastlines from the earthquake and tsunami
that devastated northeastern Japan Friday.

Crew patches for Expeditions 26 and 27 are now available from our store.

Good Clear Skies
Colin James Watling
Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)

Tuesday, 15 March 2011

SPA ENB No. 306

                 The SOCIETY for POPULAR ASTRONOMY
         Electronic News Bulletin No. 306      2011 March 6
 Here is the latest round-up of news from the Society for Popular
Astronomy.  The SPA is Britain's liveliest astronomical society, with
members all over the world.  We accept subscription payments online
at our secure site and can take credit and debit cards. You can join
or renew via a secure server or just see how much we have to offer by
University of Hawaii
A telescope called Pan-STARRS on Haleakala, an extinct volcano on Maui
(one of the Hawaiian islands), discovered 19 near-Earth asteroids on
the night of January 29, the most such asteroids discovered by one
telescope on a single night.  Asteroids are easy to discover, on an
image that goes sufficiently deep, because they appear to move
against the background of stars, and nearby ones move quickly.  To
confirm such discoveries and to determine the orbits so that the
objects can be found again and recognised in the future, several
observations need to be made within a few days.  Details of
discoveries are sent to the Minor Planet Center in Cambridge,
Massachusetts, which collects and disseminates data about asteroids
and comets so that other astronomers can re-observe the objects.
Widespread snowstorms had closed down many observatories in North
America, but telescopes in Italy, Japan and the UK, and the Faulkes
Telescope on Haleakala, as well some in mainland America, helped to
confirm seven of the January 29 discoveries.  The original observers
themselves spent the next three nights searching for the asteroids
with telescopes at Mauna Kea in Hawaii.  On the 30th they confirmed
that two of them were near-Earth asteroids before snow on Mauna Kea
obliged the telescopes to close.  On the 31st, they confirmed nine
more before fog set in.  (The impression is given that observing
conditions are not uniformly perfect even at the best places!)  Two
days later they searched again for four, but found only one. After
that, the remaining unconfirmed ones would had moved too far to be
found again.  [Impossible to say how many were confirmed and how many
not -- the numbers don't add up unless indeed the 19 referred to at
the beginning is to be taken as the number of *confirmed* discoveries.
- ED.]
BBC News
The spacecraft 'Messenger' is due to enter orbit around Mercury on
17 March, if everything goes according to plan.  It has already made
three fly-bys of the planet in the course of adjusting its orbit so as
to reduce the velocity change needed for orbit insertion.  The only
previous spacecraft to visit Mercury was Mariner 10, which made
several passes in the 1970s but did not go into orbit around the
planet.  It sent back pictures that looked very much like those of the
Moon.  Mercury seemed to some people at the time to be uninteresting
in comparison with Venus, Mars and the outer planets.  But
observations from the Earth began to show that it is far from being
boring.  It is a planet of extremes: although it is the closest to the
Sun, yet it could have ice at its poles, and it has a metal core that
is larger than any other in relation to the size of the planet.
Obviously we can hope to learn far more from an orbiting craft than
from one that just flies past.
Using the Very Large Telescope, astronomers have been able to study
the short-lived disc of material around a young star that is in the
early stages of making a planetary system.  For the first time a
smaller companion could be detected that may be the cause of a large
gap found in the disc.  Future observations will determine whether the
companion is a planet or a brown dwarf.  Planets form from the discs
of material around young stars, but the transition from dust disc to
planetary system is rapid and few objects are caught during that
phase.  One such object is T Chamaeleontis (T Cha), a faint star that
is comparable to the Sun but very near the beginning of its existence.
T Cha lies about 100 parsecs away and is only about seven million
years old.  Up to now no forming planets have been found in such
transitional discs, although planets in more mature discs have been
seen before.
The astronomers found that some of the disc material formed a narrow
dusty ring only about 20 million kilometres from the star.  Outside
that inner disc, they found a region devoid of dust out to 1.1 billion
kilometres from the star, beyond which radius there was further dusty
material.  They considered that they could see the signature of an
object located within the gap in the dust disc, about one billion
kilometres from the star -- slightly further out than Jupiter is
within our Solar System and close to the outer edge of the gap.  That
is the first detection of an object much smaller than a star within a
gap in the supposedly planet-forming dust disc around a young star.
The evidence suggests that the companion object cannot be a normal
star but it could be either a brown dwarf surrounded by dust or else a
recently formed planet.
The discovery of a rapid decline in the temperature of an ultra-dense
star has provided the first evidence for a bizarre state of matter in
the core of a star.  Astronomers have used data from the Chandra X-ray
Observatory to show that the interior of a neutron star contains
superfluid and superconducting matter, a conclusion with important
implications for understanding nuclear interactions in matter at the
highest known densities.  That news comes from studies of the
supernova remnant Cassiopeia A (Cas A), the remains of a massive star
that exploded about 330 years ago as seen from here.  A sequence of
Chandra observations of the neutron star, the ultra-dense core that
remained after the supernova, shows that that object has cooled by
about 4% over a ten-year period.
Neutron stars contain the densest matter known.  The pressure in the
star's core is so high that most of the electrons there are forced to
merge with protons, producing neutrons.  That leaves a star composed
mostly of neutrons, with some protons, electrons and other particles.
Theoretical physicists have dreamed up detailed models for how matter
should behave at such high densities, including the possibility that
superfluids may form.  Superfluidity is a friction-free state of
matter, and superfluids created in laboratories on Earth exhibit
remarkable properties, such as the ability to climb upward and escape
from airtight containers.  Superfluids made of charged particles are
also superconductors, which allow electric currents to flow with no
resistance. (Such materials have widespread technological applications
on Earth, for instance in the superconducting magnets in magnetic
resonance imaging (MRI) machines used in hospitals).
The rapid cooling in Cas A's neutron star is the first evidence that
the cores of such stars are made of superfluid and superconducting
material.  Astronomers say that the rapid cooling is explained by the
formation of a neutron superfluid in the core of the star, within
about the last 100 years as seen from the Earth.  Theory suggests that
a neutron star should undergo a distinct cool-down during the
transition to the superfluid state, as nearly massless, weakly
interacting particles, called neutrinos, are copiously formed and then
escape from the star, taking energy with them.  The rapid cooling is
expected to continue for a few decades and then to slow down.  The
onset of superfluidity in materials on Earth occurs at extremely low
temperatures near absolute zero, but in neutron stars it may be able
to occur at temperatures near a billion degrees.  However, until now
there has been a very large uncertainty in estimates of the critical
temperature, which the new research constrains to between half a
billion and just under a billion degrees C.
Scientists have extended a directly-measured 'yardstick' three times
further into the cosmos than ever before, an achievement with
important implications for numerous areas of astrophysics, The
continent-wide Very Long Baseline Array (VLBA) can produce images
hundreds of times more detailed than those from the Hubble telescope.
New measurements with the VLBA have placed the galaxy NGC 6264 at a
distance of 450 million light-years, with an uncertainty of no more
than 9%.  That is the furthest distance ever directly measured.  Until
recently, distances beyond our own Galaxy have been estimated through
indirect methods.
The VLBA is also re-drawing the map of our own Galaxy.  Recent work
has added dozens of new measurements to star-forming regions in the
Milky Way.  The direct VLBA measurements improve on earlier estimates
by as much as a factor of two.  That improvement significantly aids in
understanding the physics of the young stars and their environments.
Earlier work showed that the Milky Way is rotating faster than
previous estimates had indicated.  That measurement in turn showed our
Galaxy to be more massive, equalling our neighbour, the Andromeda
Galaxy, in mass.
Bulletin compiled by Clive Down
(c) 2011 the Society for Popular Astronomy
Good Clear Skies
Colin James Watling
Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)