Mercury-3

If you were on the planet Mercury, what you would see is the Sun rising in the East; then it would climb into the sky, and then the Sun would stop at a certain point, move slightly backwards, stop again; and then carry on and set in the West. The way Mercury turns on its axis suggests that just beneath its thin silicate crust lies a large fluid mantle. it's so dense that scientists believe it must be made from molten iron blended with a little sulphur; and as for atmosphere, Nicholas declares: ‘on Mercury we don't talk about an atmosphere, but instead we talk about an exosphere: that's to say, something which is very tenuous: basically linked to ‘outgassing’ due to the solar wind... So there are a few particles that are around Mercury, but it's very, very thin. Before the first space probes flew to Mercury, some people had wrongly assumed it was a rather dull planet, simmering in the heat of the Sun. Mercury has been known about for a long time. I mean the Egyptians already give information about the existence of Mercury, recognizing it as a planet; but real observations of Mercury didn't start until much later. The first signs that Mercury was more mysterious than imagined came when the Mariner 10 mission flew by in 1974. It sent back intriguing images of the surface and picked up signs of a weak magnetic field. Since 2011, the NASA probe Messenger has been orbiting Mercury, mapping the surface in detail. it's picked up signs of ancient volcanoes, and of a cooling inner layer, yet so much remains to be discovered.