Venus is pictured here using radar data from the 1991 Magellan orbiter.

In fact it does!

The true temperature of Venus was measured by observing it with radio telescopes! Astronomers learned that Venus is much hotter than it should be. The reason? Heat is trapped by the planet's atmosphere -- a greenhouse effect.

And, like Mercury, Venus' surface can be studied by radar.

This image of Venus represents more than a decade of radar observations! Blue and purple show areas of low elevation. Tan areas are highlands.