Phobos and Deimos – these names from Greek mythology were given to the moons of our neighbouring planet Mars, discovered in 1877 by the US astronomer Asaph Hall. Besides Earth's Moon, they are the ...

It's called Deimos, and is much smaller and more mysterious than Phobos, the first moon of Mars. The pictures were taken by the ESA's Hera mission, which is on its way to an asteroid called ...