| Meteors that reach the Earth's surface are called ____. |
asteroids |
| Stars arise in freezing clouds of dust and gas known as ____. |
comets |
| Millions of ____ (huge rocks) orbit between Mars and Jupiter. |
constellations |
| Most ____ originate in the Kuiper belt or the Oort cloud. |
meteorites |
| When asteroids smash together, ____ (small rocks) break off. |
meteoroids |
| Mizar and Alcor are double ____ in the Big Dipper asterism. |
meteors |
| The celestial sphere is divided into 88 ____. |
nebulae |
| Meteoroids that enter the Earth's atmosphere are called ____. |
stars |
