Venus is the most Earth-like planet in the solar system (it’s similar in size, mass, and composition); however, it is terribly unEarth-like. Similar to Earth, Venus has an atmosphere that envelops the planet. However, this is a extremely dense atmosphere that is full of greenhouse gasses. In fact, the atmosphere is so thick that is causes the surface temperatures on the planet to exceed 870 °F (465 °C), which, by the way, is hot enough to melt lead.
Saturn's giant moon Titan is home to vast hydrocarbon seas. Now, researchers have spotted waves on at least 3 different seas - and they've also come up with the first estimates of what these mysterious seas are made of. Spacecraft spots probable waves on Titan’s seas | Science/AAAS | News