| A | B |
|---|
| new moon | moon is in the sky but can't be seen on Earht |
| waxing | any point between the new moon and a full moon |
| waning | any time between a full moon and new moon |
| full moon | all of the Moon's surface facing Earth can be seen |
| lunar eclipse | when the Earth passes directly between the Sun and Moon casting a shadow on the Moon |
| solar eclipse | when the Moon passes directly between the Earth and Sun casting a shadow on Earth |
| inner planets | smaller, rocky planets with lower gravity and smaller orbits |
| outer planets | larger, gaseous planets with higher gravity and larger orbits |
| comet | mass of dust and roc particles held by frozen water and methan that orbits in space |
| meteoroid | small pieces of comet |
| meteor | small pieces of comet that enter Earth's atmosphere |
| asteroid | piece of rock made of material that was used to form the planets |
| spiral galaxy | galaxy with arms that curve out |
| elliptical galaxy | round or football shaped galaxy |
| irregular galaxy | galaxy with many shapes that are much smaller |
| galaxy | large group of stars, gas, and dust held together by gravity |
