Astronomy Review

4. Planets with solid, rocky surfaces (Mercury, Venus, Earth, Mars) are called _______ planets.
7. Type of eclipse that happens when the moon is between the Sun and Earth
8. The phase of the moon where the illuminated portion is "shrinking" from our view.
10. The planet right beside the Sun
11. The process in the Sun's core where hydrogen atoms join to form helium, releasing energy.
14. A natural satellite that orbits a planet.
17. How bright a star looks to an observer on Earth.
19. The only star in our solar system
20. Caused by the gravitational pull of the moon

1. The movement of Earth around the Sun, taking approximately 365.25 days.
2. The distance light travels in one year; used to measure distances between stars.
3. A streak of light caused by a space rock burning up in Earth's atmosphere.
5. The actual brightness of a star if it were viewed from a standard distance.
6. The Earth's ______ causes the seasons.
8. The phase of the moon where the illuminated portion is "growing" from our view.
9. The total amount of energy a star emits per second.
12. The spinning of Earth on its axis, which causes day and night.
13. This colour star is the hottest in temperature.
15. Colorful lights in the sky caused by solar particles interacting with Earth's magnetic field.
16. A small, icy body that releases gas or dust, forming a "tail" when near the Sun.
18. _____ planets composed mostly of hydrogen and helium (Jupiter, Saturn, Uranus, Neptune).