| A | B |
|---|
| meteorite | pieces of rock or metal that fall from space and crash land |
| atmosphere | a blanket of air that surrounds the Earth |
| astronomer | a scientist who studies objects in space |
| telescope | a device that makes faraway objects look larger |
| crater | a pit shaped like a bowl |
| lunar | referring to things about the Moon |
| gravity | a pull that every object has on every other object |
| star | a ball of hot gases |
| rotation | the spinning motion of a planet |
| axis | a make-believe line that runs through the earth's north and south poles |
| constellation | nighttime star pattern |
| revolution | to travel around the Sun along its own path |
| orbit | a path shaped roughly like a circle |
| phase | changing shape of the Moon |
| equator | an imaginary line that circles Earth halfway between the two poles |
| season | caused by the tilt of the Earth's axis |
| solar eclipse | when the Moon moves directly between the Sun and the Earth |
| lunar eclipse | when the Moon moves into the Earth's shadow |
| flare | a bright area on the surface of the Sun caused by a solar storm |
| planet | any large body that orbits a star and does not produce light of its own |
| sunspot | a dark area on the Sun caused by a solar storm |
| solar system | the sun and all the planets and other objects that orbit it |
