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science test 1
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| Question | Answer |
|---|---|
| orbit | a regular, repeating path that one object in space takes around another one |
| revolve | the movement of one object in a circular or elliptical path around another, central object |
| rotate | the spinning motion of an object around its own internal axis |
| axis | an invisible line around which an object rotates, or spins |
| wanning | the part of the moon’s cycle when its illumination is gradually decreasing |
| waxing | the part of the moon’s cycle when its illumination is gradually increasing |
| planet | A celestial object that (1) orbits a start, (2) is round, and (3) has cleared the objects in its orbital path |
| asteroid belt | a region between the inner and outer planets that contains asteroids held together by gravity |
| gravity | an invisible force that pulls any two objects with mass towards each other |
| accretion | the coming together and clumping and sticking together of matter due to gravity to form larger and larger objects |
| galaxy | a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity |
| universe | All of space, all of the matter, and all of the energy in it |
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