science

2. A thick layer of ice and snow that covers less than 50,000 km2 planets Mercury, Venus, Earth, and Mars, all rocky plane ic field The area around a magnet in which there is a magnetic force.
8. A mixture of gases that surround a planet or moon.
10. The natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
11. The study of matter.
12. The path that a body follows as it travels around another body in space. the planet, Gassy planets: Jupiter, Saturn, Uranus, or Neptune.
14. Moon gets larger.
15. The star at the center of our solar system.
16. An instrument that collects electromagnetic radiation from the sky and concentrates it for better observation.
19. A small, rocky object that orbits the sun.
20. The force between a planet and other objects.
21. A bright streak of light that results when a meteoroid burns up in the Earth’s atmosphere.

1. Anything that has mass and takes up space.
3. tilt The angle between the planet’s rotational axis and its orbital axis. a small body of ice, rock, and cosmic dust with an elliptical orbit around the sun that forms a tail. planet A celestial body that orbits the sun has enough mass for a round shape has not cleared the neighborhood around its orbit and is not a moon.
4. An event in which the shadow of one celestial body falls on another.
5. The spin of a body on its axis. model, A physical representation of something too large or too small to see that has a size relationship.
6. An orbital position with special climate conditions: spring, summer, nt radiation, Radiant energy from the sun. system Gravity bound system to sun and objects that orbit it.
7. The periodic rise and fall of the water level in the gets smaller.
9. All space and time and their contents.
10. phase The lunar phase or Moon phase is the shape of the directly sunlit portion of the Moon as viewed from Earth
11. A planet orbits a star is rounded by gravity and cleared its neighborhood.
13. The motion of a body that travels around another body in space; one complete trip along an orbit.
17. A vehicle or machine designed to fly in outer space.
18. The third rocky planet from the sun with 70% covered in water.