Two moons, two moons of Mars — Phobos and Deimos are small, irregular, but are spinning in the same Equatorial plane as the Red planet. For a long time they were considered captured asteroids, but their orbits greatly reduce the chances of it. There was also a possibility that there was a massive collision, from which was born the disk fragments like formed our Moon. This alternative creates an Equatorial orbit, but usually produces one very large moon. And here's the new simulations showed that a collision could create three moons near Mars, and the biggest of them gradually collapsed, leaving us with Mars system, as it is.
a Serious collision with an asteroid billions of years ago could build satellites of Mars, including the inner, larger, which has never been seen
We are accustomed to our moon, but actually it's pretty weird by the standards of solid planets. Of all the solid worlds in our Solar system earth is the only one with a large Moon. Mercury — the moonless, Venus — no moon, Mars has only two very small moons, Phobos and Deimos. Phobos and Deimos are not like our own moon; they are only 22 and 12 kilometres in diameter, small and oddly shaped. In truth, they are more like asteroids.
steroidogenic the Relative sizes of the satellites of Mars, Phobos and Deimos
But gravitational capture of asteroids — it was an accident. They must be on a retrograde orbit or hard to bend in any direction, but the two located on an ideal circular orbits, and unusually close to Mars. Their composition and appearance can talk about the asteroid, but the orbit is talking about something else entirely.
the Orbits of Phobos and Deimos are in the same Equatorial plane
A Circular orbit in General appear when something formed long ago, from the original disk configuration and wreckage of a particular type. Our planet circling around the Sun, because formed in the early protoplanetary disk; the satellites of the gas giants formed from okoloplodnykh drive your world; our moon's nearly circular orbit, because it was formed from a giant collision that created a huge, massive disk around the Earth about 4.5 billion years ago.
the Northern 40% of Mars is 5 km lower in height than the rest of the planet. This giant feature, known as the Borealis basin, was created in the collision process, which could pick up enough debris to form many moons
Mars, like many other worlds in our Solar system, drew on their surface traces of a history of a severe collision. Some of them, small, left modest craters, while others were enormous and gave rise to something like a pool of Borealis. This strike had to occur billions of years ago, but had to throw a lot more debris and garbage that they emerged from only two small moon. They are both close enough to Mars.
In an article published in the journal Nature Geoscience, a team of scientists under the leadership of Pascal Rosenblatt showed that a powerful blow had to be from Mars thick disk of debris. For a few thousand years he formed big moon with a width of several hundred kilometers, close to the surface of Mars. The gravitational influence that it had on the external drive resulted in the instabilities that result from the disc also appeared Phobos and Deimos.
And even though the Moon will be doomed to destruction by tidal forces and a gradual falling to the surface of Mars, the other moon will remain. At this point, in the past, Phobos and Deimos had a lot in common, but this similarity only lasted a few million years. In a few billion years Phobos will also be destroyed. If the new theory is correct, scientists of the future will find only the Deimos and pools on Mars, collecting the story in parts. The past in the Solar system and the Universe, we are forced to only study.
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