Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The branch of astronomy that studies bodies in the solar system by analyzing the reflections of radio waves sent from Earth.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A technique that uses radar
echoes to examine bodies within thesolar system , obtaining information aboutsize ,shape ,topography ,surface density ,spin etc.
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