Astronomy S2

2. split into two smaller atoms
3. one that can support life for a significant amount of time
5. the type of tide that causes low tide from the sun, moon, and Earth being at a 90degree angle (1/4 or 3/4 moon)
8. a time of year when the sun crosses the equator, resulting in nearly equal amounts of day and night
9. the action of the Earth traveling around the sun
11. the imaginary line that splits the north and south
12. During fusion the sun looses
13. This Kepler's law says a planet's orbital period is proportional to the size of its orbit (its semi-major axis)
17. This Kepler's law says all planets orbit the sun in an ellipse
18. the shape all planets orbit in
20. a star that all planets orbit around
21. deviation of a curve or orbit from circularity

1. a type of planet that is big, low density, can have rings, and cold.
2. Combining two elements like Hydrogen to make one product like helium
4. This Kepler's law says a planet covers the same area of space in the same amount of time no matter where it is
6. the type of tides that cause high tides from the sun, moon and Earth being in a straight line (Full or New moon)
7. the prefix for living or life
10. a type of planet that is small, warm, rocky, and high density.
14. the action of the Earth spinning on it's axis
15. a giant cloud of dust and gas in space
16. the time when the Sun reaches its most northerly or southerly tilt to create summer or winter
19. The layer of the sun where fusion takes place