Astronomy

2. Largest objects in the Solar system which revolve around the Sun.
3. Closest planet to the Sun
9. Blocking of Sunlight to the moon, this can occur during a full moon
12. Layer of air, made up of many layers and gases surrounding the Earths and other planets' surface.
13. Second closest planet to the Sun. Sometimes called earth's twin.
14. Complete shadow, the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
15. sunlight on its surface.
16. the spinning of Earth in its axis.
17. a person who is trained to travel in a spacecraft.
18. primary source of heat and energy for the solar system.

1. Blocking of Sun's light which can occur during a new moon.
4. small body of ice, rock and cosmic dust that follows an elliptical orbit around the Sun.
5. little chunks of rock and debris in space that falls through a planet’s atmosphere.
6. A satellite is a natural or man made object that orbits around a planet.
7. the movement of one object around another object.
8. Largest planet in the solar system
10. Sixth planet to the Sun, second largest planet in the solar system.
11. Partial shadow, lighter, outer parts of a shadow. the partially shaded outer region of the shadow cast by an opaque object.