Astronomy

3. A group of stars that form a pattern
5. the first layer of the atmosphere and it contains all life
6. A repeating cycle that one celestial body takes around another.
7. When the moon is completely visible from Earth
8. the second layer and it contains the ozone layer
10. Any object that orbits a planet or a sun
11. the third layer of the atmosphere and it is where meteors burns up
13. When the moon is invisible to Earth
18. The region between Mars and Jupiter that contains the largest population of asteroids in our solar system
19. How much material an object is made up of
20. A half of the Earth, when divided along the lines of either North and South or East and West
21. A piece of rock or that lands on Earth’s surface
23. When day and night are the same length. This happens twice a year
24. The force that pulls objects towards each other

1. When one celestial body blocks light from reaching another by moving between it and its light source
2. When the moon becomes gradually less visible
4. Streaks of light in the sky that occur when meteoroids fall into the Earth’s atmosphere and burn up
9. the fourth layer of the atmosphere and it is where auroras take place.
12. A building used to observe outer space
14. When the moon becomes gradually more visible
15. A piece of rock from outer space that enters Earth’s atmosphere
16. The shortest and longest days of the year
17. A celestial body that orbits the sun that has sufficient mass for its gravity to overcome rigid body forces and has "not cleared the neighborhood" around its orbit
18. Small, rocky objects that orbit the Sun
22. The star that objects in our solar system orbit