Space Crossword

1. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun
5. relating to or determined by the moon.
8. relating to or determined by the sun.
9. the circular motion of an object around an axis, or central line.
11. a scientist who studies the universe beyond Earth's atmosphere
12. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
13. an imaginary line that runs through the center of a celestial object, around which it rotates or spins
15. an astronomical event that occurs when one celestial object passes into the shadow of another
16. a small rocky body orbiting the sun
17. the study of the universe beyond Earth, including celestial objects and their processes
18. a tool that astronomers use to see and study distant objects in space
20. a closed curve in geometry where the sum of the distances from any point on the curve to two fixed points (called foci) is always the same
21. a time when the Earth's equator crosses the sun, resulting in nearly equal amounts of day and night

2. an imaginary line that divides the Earth into the Northern and Southern hemispheres
3. half of a sphere or celestial body
4. the repeating path that one celestial body takes around another, typically caused by the gravitational pull between the two objects, and usually following an elliptical shape
6. once a year
7. during the day or on a daily basis
8. a moment in time when the sun is at its furthest point north or south of Earth's equator (winter and summer)
10. the gravitationally bound system of the Sun and the objects that orbit it. I
14. a group of stars that appear to form a pattern in the night sky
19. oval-shaped, or slightly flattened compared to a circle