Small, dense rocky planets made of rock and iron are called

Mercury is this many kilometers from the sun:

Venus is this many kilometers from the Sun:

Surface is hidden by thick clouds of mostly carbon dioxide.

density, size, and structure are similar to Earth's

Surface is heavily cratered from collisions with small, rocky objects.

Long cliffs also cover parts of its surface.

takes 225 days to revolve around the sun.

Daytime temperatures reach 430 degree Celsius and nighttime is -180 degrees Celsius.

revolves around the sun every 88 days.

These probes have been able to send back images of sand dunes and ancient lava flows.

Dense atmosphere lets very little sunlight penetrate to the surface.

The sunlight that does penetrate the clouds cannot escape back into space, this results in a surface temperature of 470 degree Celsius.

rotates from east to west

Has the greatest daily temperature extremes of any planet.

Does not have an atmosphere