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Posted on 01/07/2009 5:24:25 AM PST by Red Badger
Since Aristotle’s first theory on the Milky Way to present times, there’s still so much astronomers need to learn about the galaxy our Solar System lies in. Over the course of time, the observations made on the Milky Way itself seemed harder to do than on any other galaxy, simply because they had to be made from within the galaxy, offering very little perspective.
That is why the latest findings by scientists at the Harvard-Smithsonian Center for Astrophysics should come as no surprise. As it appears, not only were we wrong about the speed and weight of our Galaxy, but the likelihood of a collision with a nearby galaxy is also bigger than ever.
Astronomers have predicted that a collision between the Andromeda galaxy and the Milky Way is bound to take place. The result of that would be the formation of a new, larger galaxy..
Andromeda is a spiral galaxy of a similar size to ours, and is believed to have collided with at least one other galaxy in the past, according to specialists. Despite predictions, we shouldn’t worry though, since astronomers predicted the collision will take place in three to four billion years’ time. The European Space Agency will send the Gaia mission in late 2011 to investigate our galaxy.
Measurements have shown that Andromeda is approaching the Milky Way at almost 140 kilometers per second. The most recent study by astronomers at the Harvard-Smithsonian Center for Astrophysics suggested that our Galaxy is actually rotating 100,000 miles per hour faster than thought, which means a significant increase in mass, but also a greater gravitational pull that increases the likelihood of a collision with Andromeda or other smaller nearby galaxies.
Before the Very Long Baseline Array (VLBA) measurements made by scientists at the Harvard-Smithsonian Center for Astrophysics, the Milky Way was believed to be smaller than Andromeda. However, by studying the areas of star formation in our Galaxy at times when the Earth was at opposite sides of its orbit around the Sun, they were able to obtain the slight apparent shift of the object’s position against the background of more distant objects.
Karl Menten of the Max Planck Institute for Radio Astronomy in Germany, a member of the team of astronomers involved in the study, said the new measurements revise their understanding of the structure and motions of the Galaxy.
These VLBA observations produce highly-accurate direct measurements of distances and motions, and astronomers found direct distance measurements to differ from earlier, indirect measurements sometimes by a factor of two.
The VLBA is a system of 10 radio-telescope antennas that stretch from Hawaii to New England and the Caribbean, and has the ability to provide the most accurate observations to date. The system is even able to produce images hundreds of times more detailed than the Hubble Space Telescope.
Hey, at least those Andromeda aliens won’t have to turn us all into dessicated cubes and rig the Enterprise to make the trip across in a few decades.
Thanks Red Badger.
Astrophysicists Map Milky Way’s Four Spiral Arms
www.sciencedaily.com | 01/07/2009 | Iowa State University
Posted on 01/07/2009 10:28:20 AM PST by Red Badger
http://www.freerepublic.com/focus/f-chat/2160370/posts
Milky Way — the galaxy — not snack-sized anymore
Associated Press | Jan. 5, 2009 | Seth Borenstein
Posted on 01/05/2009 11:16:51 AM PST by decimon
http://www.freerepublic.com/focus/f-chat/2159109/posts
Milky Way a Swifter Spinner, More Massive, New Measurements Show
Harvard-Smithsonian Center for Astrophysics | 1/5/09 | CfA
Posted on 01/05/2009 2:41:26 PM PST by NormsRevenge
http://www.freerepublic.com/focus/f-chat/2159221/posts
Milky Way ‘bigger than thought’
BBC | 01-07-09 | Staff
Posted on 01/07/2009 5:19:26 AM PST by Red Badger
http://www.freerepublic.com/focus/f-chat/2160162/posts
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This is what you get when two galaxies collide.
That must give Andromeda strain!
Do they need a bail out?
Yes.
Bring a bucket.
I wonder if most other galaxies are named after candy bars or after cartoon characters?
Somebody used a really tall tripod.
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