| A | B |
|---|
| axis | imaginary line around which an object spins |
| ellipse | oval-shaped, all planets orbits have this shape |
| 1st quarter | right half of moon visible |
| full moon | whole moon visible |
| lunar eclipse | sun-earth-moon |
| mare | flat, dark regions on moon |
| rilles | channels cut by running lava on moon |
| moon phase | change in moon appearance as it orbits Earth |
| new moon | no moon visible |
| revolution | orbit, journey of one object around another |
| rotation | spinning of an object on its axis |
| solar eclipse | sun-moon-earth |
| 3rd quarter | left half of moon visible |
| waning | left side of moon visible |
| waxing | right side of moon visible |
| regolith | powder on moons surface |
| oort cloud | sphere past neptune where comets come from |
| kuiper belt | disc shape belt of rocks past neptune |
| umbra | dark shadow caused by eclipse |
| penumbra | light shadow caused by eclipse |
| apogee | moon farthest from earth |
| perigee | moon closest to earth |
| meteor | space rock falling through earths atmosphere |
| meteoroid | small space rock |
| meteorite | space rock that hits earth |
| comet | ball of ice rock and metal |
