Space

3. curved path in space that is followed by an object going around and around a planet, moon, or star
4. a piece of matter from outer space that enters the earth's atmosphere, often as a streak of light
7. all of space and everything in it
9. a single turn around an axis
10. a star (sun) and the objects that orbit around it
11. rocky remnants orbiting the sun made of rock and/or metal
14. a collection of stars and planets and everything in it
16. a single journey along an orbital path
17. an imaginary line about which a body (Earth) rotates
18. the study of stars, planets, and space

1. a large hole in the ground of a planet or the moon, caused by something hitting it (a meteorite)
2. summer solstice is the day of the year with the most hours of daylight, and the winter solstice is the day of the year with the fewest hours of daylight
5. one of the two days in the year when day and night are of equal length
6. a large piece of rock or metal from space that has landed on Earth
8. a group of stars in the sky that create a picture in the night sky
12. on Earth, seasons result from Earth's tilt and orbit around the Sun resulting in the change of the weather and amount of daylight
13. a very large ball of burning gas in space that is usually seen from the earth as a point of light in the sky at night
15. are cosmic snowballs of frozen gases, rock and dust, with a long tail that travel the Sun