Venus' atmosphere is _____________ times thicker than Earth's

Which planet has a year longer than a day?

Maxwell Montes is the highest point on which planet?

Mercury has a large iron core giving the planet

The largest mountain in the solar system is located on which planet?

Which object is brightest in the night sky?

On Venus, the Sun rises in the

The most recent mission to Mars that landed a machine on the surface is

Mercury looks very similar to

Water ice can be found on all planets except

Mercury is generally visible only __________

The planet with the most moons is __________ with a total of ____________ moon(s)

The third smallest planet is called

The most common molecule in the rain of Venus is