| The shapes of the planetary ____ are elliptical. |
asteroids |
| There are eight ____ orbiting the Sun. |
constellations |
| The celestial sphere is divided into 88 ____. |
degrees |
| Millions of ____ orbit between Mars and Jupiter. |
gasses |
| Crewless ____ (orbiters, landers, rovers) have been sent to Mars. |
moons |
| Unlike the other planets, Mercury and Venus have no ____. |
orbits |
| The Sun is mostly hydrogen (H) and helium (He) ____. |
planets |
| The sun appears to move across the sky 360/24 ____ per hour. |
spacecraft |
