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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 |