But verifying that assumption was difficult, given how crowded the region is, which makes it difficult to examine individual star motions
Astronomers develop theories of star motions
to not only understand how the stars in our galaxy are moving today but also how our galaxy formed and evolves.
Using telescopes that detect radio waves to penetrate the dust and gas, as well as optical telescopes to study star motions
, astronomers have mapped the Milky Way.
act as tracers to probe the gravitational signature of all mass, regardless of its nature.
A powerful computer and special hardware calculate and display star motions
and positions instantly, enabling audience members to time-travel and see how the Big Dipper looked 100,000 years ago or how Orion the Hunter will appear ten centuries years in the future.
A precise measurement of star motions
in giant clusters can yield insights into how stellar groupings formed in the early universe, and whether an "intermediate mass" black hole, one roughly 10,000 times as massive as our Sun, might be lurking among the stars.
The second problem was creating the global reference star catalog that Herget and Corbin had proved would work, since all existing catalogs suffered either from insufficient stars or inadequately precise star motions
sometimes suggest that certain stars are revolving in binary systems.