The Planet Mercury

Get to know the smallest planet in our Solar System with this 10-question quiz on Mercury.

It mixes fill-in-the-blank and true or false items, with prompts like How long is Mercury year? and What was the first spacecraft to visit Mercury?, so it is friendly for newer students.

One of the strangest facts here is how a single day on Mercury compares to its year. A day on the planet actually stretches across a big chunk of its trip around the Sun, which feels backwards at first.

You will also see why Mercury is so tricky to spot in the sky.

Recommended level: beginner.