Or how about this: Standing on Earth s equator you d experience a sideways velocity due to Earth s spin of about 1,700 kilometers per hour. Standing on the equator of one of these brown dwarfs that you d be moving more like 375,000 kph!
Whoa. In fact, they re spinning so rapidly that the centrifugal force outward is nearly equal to their gravitational force inward. In other words, if they spun much faster
they d literally fly themselves apart.
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Diagram showing relative masses and sizes of planets, brown dwarfs, and stars. The star shown would be an extremely low mass red dwarf, which can be roughly the same size as Jupiter though much denser. Credit: NASA/JPL-Caltech
Il Direttore delle Scienze planetarie alla NASA, Jim Green dichiara: abbiamo trovato Planet X!
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Deep Impact: tre Asteroidi si avvicinano alla Terra
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