This planet is the "3rd rock from the sun". It has a large amount of water on its surface and is the only planet that currently has conditions which sustain life as we know it.
What is Earth?
Small and recently re-classified as a dwarf planet, this is the littlest planet found furthest out in our solar system.
What is Pluto?
This is the largest planet in the solar system.
What is Jupiter?
These are the two rovers that are currently exploring and observing the surface of Mars.
Or name any other rover sent to Mars.
What are Spirit and Opportunity?
The sun's rays strike Earth most directly along here.
What is the equator?
This is the lander craft that brought two rovers to Mars to investigate. Hint: it is named after a fiery mythological bird.
What is The Phoenix?
This is the term used to describe a star that has stabilized.
What is a main-sequence star?