Mercury is the closest planet to the Sun and due to its proximity it is not easily seen except during twilight. For every two orbits of the Sun, Mercury completes three rotations about its axis and up until 1965 it was thought that the same side of Mercury constantly faced the Sun.
Astronomers have identified one of the “richest” planetary systems discovered so far, which includes seven planets, informs bbc.co.uk. The discovery of the seventh planet around the dwarf star KIC 11442793 could be considered a record, said two different teams of researchers.
Recently, NASA’ Kepler Telescope discovered the smallest three planets found so far in another solar system. Even more interesting is that all three planets — one of them is the size of Mars — are solid planets, like Earth.