What are the months of "Big Seven"?

"Big Seven" concerns the greatest months in the solar system, one of which is even larger than the planet Mercury. The large seven is larger than all other months in the solar system with a significant margin. They are in descending order of size: Ganymede (Jupiter), Titan (Saturn), Callisto (Jupiter), Io (Jupiter), Luna (Country), Europa (Jupiter) and Triton (Neptun). They range from 2707 km to 5262 km. The eighth largest month in the solar system is Titania, the largest moon of uranium, with an average of 1578 km. Ganymede is so great that it has its own magnetic field, while titanium is the only month in the solar system with its own atmosphere. It is assumed that Europa has large subsurface oceans with conditions that astronomers have long considered a suit.

Despite our close acquaintance, Luna is also quite unusual. From the Earth's point of view, it almost perfectly covers the disk of the Sun, which is a pure coincidence. VZHThe ice to the size of the planet, which is orbit, is an enormous planet of similar size, Mars, has only a few small months and Venus and Mercury have no at all. For this reason, it is assumed, among other things, that Luna was made of a detritus of a massive impact where a planetoid of Mars the size of Mars hit the ground and kicked the huge parts of the bark to create a moon. Where this planetoid went, no one knows.

Four of the Big Seven orbit the largest planet of the solar system, Jupiter. Originally discovered Galileo Galilei in 1610 using one of the earliest telescopes, called Galilean Moons. They were studied and extensively photographed in Fly-Bys by a series of space probes. Another probe, juno , is scheduled to visit Jupiter in 2016.