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Vocab Mars
Discovering Mars
| Term | Definition |
|---|---|
| astronomer | an expert in or student of astronomy |
| poles | either of the two locations ( North Pole or South Pole ) on the surface of the earth (or of a celestial object) which are the northern and southern ends of the axis of rotation |
| diameter | a straight line passing from side to side through the center of a body or figure, especially a circle or sphere |
| craters | a cavity or hole in any surface |
| cosmic | relating to the universe or cosmos, especially as distinct from the earth |
| ultraviolet | of electromagnetic radiation having a wavelength shorter than that of the violet end of the visible spectrum |
| microbe | a microorganism, especially a bacterium causing disease or fermentation |
| roving | constantly moving from one area or place to another |
| gravity | the force that attracts a body toward the center of the earth, or toward any other physical body having mass |
| mass | the quantity of matter which a body, or object, contains |
| permafrost | a thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions |
| ozone layer | a layer in the earth's stratosphere at an altitude of about 6.2 miles (10 km) containing a high concentration of ozone |
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