There are nearly 10 times as many galaxies in the universe as there are stars in the Milky Way. Our Sun is the most massive and luminous star in our galaxy. Human beings are composed almost entirely of …

In our galaxy alone, astronomers estimate that there are around 100 thousand million stars, nearly all of which formed in the Milky Way. However, a tiny fraction of stars might have joined the Milky Way as …

{Many stars in a typical open cluster are nearly as old as the universe} - True + False {Many stars in a typical globular cluster are nearly as old as the universe} + True - False {The number of globular …

Study with Quizlet and memorize flashcards containing terms like star:, planet:, moon/satellite: and more.

(True or False) Planets with circular orbits travel at the same speed at all points in their orbits, whereas planets with elliptical orbits change their speeds at different points in their orbits.

Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)

Halo stars are those born before the gas formed a disk, and disk stars can form only after the formation of the disk. The picture is more complex, however, because evidence indicates that there were …