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Which planet was found by mathematical prediction before anyone saw it?
Confirmed
Neptune
Irregularities in Uranus's orbit led Urbain Le Verrier and John Couch Adams to predict a new planet. It was spotted in 1846 where Le Verrier calculated.
On Venus, which is longer: a day or a year?Why does Mars look red?Saturn is mostly gas. Would it float in a big enough bathtub?Which planet in our solar system is the only one not named after a Greek or Roman god?About how far does the Moon drift away from Earth each year?What share of Earth's surface is covered by ocean?