Space

3. A celestial body moving in an elliptical orbit around a star.
5. A type of elementary particle from which protons and neutrons are formed. One of the most basic forms of matter.
9. The amount of time it takes for the Earth to spin once on its axis.
10. A small rocky body orbiting the sun. Are classified as minor planets.
11. An event in which one celestial body obscures the passage of light between another and the observer.
14. A small, frozen mass of dust and gas orbiting the sun. It spews into a giant ball of dust and gases larger than most planets if it orbits too close to the sun.
15. The force which attracts a body towards the center of an object's mass.
16. A large star around which the solar system moves.
18. A regular, repeating path of an object around another one. It is called a satellite.
20. A fixed group of stars that form configurations of creatures or objects in the sky. satellite An object such as the moon, a planet or a manmade machine that orbits a planet or a star.

1. The line at which the earth's surface and the sky appear to meet.
2. A group of stars, gas and dust held together by gravity.
4. A biannual occurrence in which the sun crosses the celestial equator, when day and night are approximately equal in length.
6. The near-vacuum between celestial bodies in where everything is found.
7. The growing of a Moon's illumination. The opposite of this process is called waning.
8. A small piece of an asteroid or a comet that has entered Earth's atmosphere. Seen as a streak of light in the sky.
12. A biannual occurrence in which the sun reaches its maximum or minimum declination marked by the longest and shortest days of the year.
13. A huge glowing ball of gas in outer space.
17. An interstellar cloud of dust, hydrogen, helium and other ionized gases that act as a nursery for new stars.
19. Eruptions on the surface of the Sun which trigger geomantic storms.