When Venus formed billions of years ago, the planet probably had about as much water as Earth.

Thick carbon dioxide clouds in Venus' atmosphere trap heat, making it the hottest planet in the solar system, despite it being farther from the sun in space than Mercury. The runaway greenhouse effect has raised the planet's temperature to a sizzling 900 degrees Fahrenheit, according to NASA

But scientists say evaporation from heat can't completely explain why Venus, sometimes known as Earth's...

Continue Reading Venus is 900 degrees. That's surprisingly not why it's bone-dry.