Unit 5 Astronomy TNN

5. an eclipse in which the moon appears darkened as it passes into the earth's shadow
8. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
9. to spin on an axis
11. a space object in a fixed point in the sky that gives off its own heat and light
12. the series of changes in the life of an organism including reproduction.
13. moving in a path around something
15. all existing matter in space
17. situated around or inhabiting one of the earth's poles
20. an event during which the moon's shadow blocks all or some of the sun's lights

1. the distance that light travels in one Earth year
2. a large sphere-shaped object that revolves around a star
3. an imaginary line through the center of an object that provides a fixed point of reference
4. a system of objects in space that includes at least one star, planet,their moon
6. a group of stars forming a recognizable patterngalaxy collection of dust, gas, stars, and their solar systems
7. to bounce back light
10. a collection of dust, gas, stars and their solar systems
14. move in a circle on a central axis
16. a dark area or shape produced by a body coming between rays of light and a surface
18. a distinct period or stage in a series of events
19. each of the four divisions of the year (spring, summer, autumn, and winter)