A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar
gas, dust, and .... Tens of thousands of galaxies have been catalogued, but only a
few have ..... Like the stars, ...
May 17, 2015 ... Get started today for free. * The material on this site is ... Why does faster rotation
tend to lead to a spiral galaxy, rather than an elliptical galaxy? Faster rotation
leads to collisions among ... Why should galaxy collision have been more
common in the past than they are today? Galaxies were closer together in ...
1) How does the interstellar medium obscure our view of most of the galaxy? ....
holes existed only when the universe was young and no longer exist today. ... E)
Galaxy collisions shouldn't have been more common in the past than they are ...
May 1, 2013 ... Models for galaxy formation have been of two basic types: ... The "top-down"
model on the origin of the galaxies says that they formed from huge gas clouds
larger than the resulting galaxy. ... There should still be galaxies forming today. ....
much closer together, so collisions should have been more common ...
However galaxies might have originated, either their formative stages or ..... by
collisions and mergers, which are more common in dense galactic environments
? ... in the past than they are today, galaxies do seem to have been more active ...
Mar 27, 2006 ... …is the study of how galaxies form and how they change over time. ... There must
have been a few smaller ... collisions will occur more often in crowded cluster
centers ... 1,000 brighter than the entire Milky Way Galaxy .... than it is today. ...
Because quasars were much more common in the past, it is likely.
Today we will take a closer look at ideas for why there are different types of
galaxies. ... If you have been watching the news coverage of the revolutions in
the Middle East, .... The largest giant elliptical galaxies are more than a million
times more ... Galaxy collisions are quite common, here are two spirals (
knicknamed the ....
Aug 15, 2013 ... Astronomers have identified more spiral galaxies than ellipticals, but that is ... If
fewer elliptical galaxies have been spotted, why do astronomers think they ... The
universe is a violent place, and collisions between galaxies are ...
In the 1930's, Edwin Hubble discoveried that all galaxies have a positive ... to
quasar, the name by which this class of objects has since been called. ... Quasars
have a decidedly non-thermal spectrum: they are luminous in the ... Back then the
galaxies were closer together and collisions were more common than today. Also
Dec 6, 1994 ... Therefore, these galaxies, which we observe as they were less than two billion ...
so many more spiral galaxies in rich clusters long ago than there are today.
Apparently, many spiral galaxies have since been destroyed or disappeared. ....
galaxy collisions can actually trigger the formation of massive stars.