Space Vocabulary Test

1. millions or billions of stars held together in a group by their own gravity
4. occurs during the spring and fall, when day and night are approximately the same times (or are equal)
6. a unmanned exploratory spacecraft that send information about its environment back to earth
7. daily rising and falling of the sea level due to the location of the sun, moon, earth, and moon system
12. the force that attracts a body toward the center of earth
13. a man-made or natural object that orbits earth or another planet
14. a group of stars that form a pattern in the sky
15. a device that gathers visible light or another form of electromagnetic radiation

2. a spacecraft designed to land on a planet's surface (ex. Mars rover)
3. suitable or good enough to live on or in
5. space and all of the matter and energy in it
8. layer of gases surrounding a planet
9. one part of a pattern of temperature changes and other weather trends over the course of the year
10. wide, flat zone of small particles that orbit around a planet's equator
11. occurs during the winter and summer, when the sun reaches the highest and lowest points in the sky at noon
15. the angle at which an object is positioned compared to its center axis (Earth = 23.5 degrees)