| A | B |
|---|
| sun | the star of our solar system, the source of heat & light |
| moon | a natural satellite of a planet |
| planet | larger than a comet or an asteroid that is lit up by a star |
| meteoroid | a chunk of rock or dust in space |
| asteroid | smaller than a planet, revolve the sun |
| comet | ball of ice & dust whose orbit is usually elliptical |
| gravity | attractive force between 2 objects |
| revolution | an object moves around another object |
| rotation | a planet spinning on its axis |
| tilt | leaning on its axis |
| seasons | one of 4 divisions of the year; different climatic conditions |
| tides | daily rise and fall of the oceans on the shores |
| space exploration | when humans started going into outer space to learn about it, either by sending manned or umanned craft into space |
| day & night | 24 hour period; 12 hours of light & darkness; caused by earth's rotation |
| MY VERY EDUCATED MOTHER JUST SERVED US NINE PIZZAS | MERCURY VENUS EARTH MARS JUPITER SATURN URANUS NEPTUNE PLUTO |
