Another moon
We use the term ‘the moon’ to describe the rock that circles the Earth.
But it is not the only moon. Most planets have a rock (or two or three, or more).
Mars has two moons, Phobos and Deimos. ESA (European Space Agency) has a spacecraft which is now passing close to Phobos and it has taken some fantastic pictures.
Phobos is quite ....
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