Venus is a Victim of a Rampant Greenhouse Effect Venus's atmosphere is made mostly of carbon dioxide, one of the greenhouse ...

It has, but it’s been quite a while. The Magellan probe was the first spacecraft to image the surface of Venus. VERITAS would do so in much higher resolution and clarity. Magellan was launched ...

So Venus presents us with an opportunity to study the ongoing evolution of a geologically active Earth-like planet. That's one of the most exciting things we've learned from the Magellan mission.