| A | B |
|---|
| what is one of Hubble's contributions to science | he developed a way to classify galaxies |
| most galaxies are classified by their | shape |
| where are newly formed stars found in a spiral galaxy | spiral arms |
| which galaxies contain mostly old stars | elliptical |
| the Milky Way is probably this type of galaxy | spiral |
| many of these galaxies may have their shape dostorted by neighboring galaxies | irregular |
| Most galaxies are this type of galaxy | spiral |
| these galaxies are massive blobs of stars | elliptical |
| these galaxies are close companions of another galaxy | irregular |
| these galaxies have a bulge in the center and spiral arms | spiral |
| a collection of stars, dust, and gas bound together by gravity is called | galaxy |
| What is NOT true of nebulas | nebulas are often found in elliptical galaxies |
| What is NOT true of star clusters | an open cluster usually has more stars than a globular cluster |
| large clouds of dust are called | nebulas |
| a tight group of stars that looks like a ball is called a | globular cluster |
| a group of stars that are closer together than the surrounding stars is called | open cluster |
| found in interstellar space | nebula |
| found ini a spherical halo that surrounds a spiral galaxy | globular cluster |
| usually found along a galaxy's spiral disk | open cluster |
| What os NOT true of quasars | quasars are among the closest objects to Earth |
| Why is looking through a telescope like looking back through time | it takes time for light to travel through space, the farther back one looks, the farther back in time one travels |
| Why di scientists study distant galaxies | to learn what early galaxies looked like and to tell us how galaxies have changed over time. Also what has caused them to form |
