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Mercury - the closest planet to the Sun... heavily-cratered. The side facing the Sun is enough to melt lead, and the size facing away from the Sun is hundreds of degrees below freezing... and it does not rotate. This is a planet of extremes.

EL PAÍSfrom EL PAÍS

Mercurio desvela sus secretos

Mercury.

Mars Express heading towards daring flyby of Phobos 23 December 2013, ESA’s Mars Express will make the closest flyby yet of the Red Planet’s largest moon Phobos, skimming past at only 45 km above its surface.

Water Ice on Mercury: Water ice deposits found in frozen craters on planet Mercury are explained in this #infographic

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All the planets in one picture…

All the planets as one