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Interesting facts about space.
Jupiter, the largest planet in our Solar System, also has the largest moon--Ganymede. A large number of Jovian moons sport highly elliptical orbits and also circle backwards--that is, opposite to the spin of their planet. Saturn, Uranus, and Neptune also sport such so-called irregular moons, that orbit far from their respective parent planets.
and here is another
The most popular theory of lunar formation suggests that the Moon was born in a monumental collision between a Mars-size object named Theia and the ancient Earth--and that this ancient smash-up would have melted our primordial planet. This model further suggests that more than 40 percent of Earth's Moon is composed of the debris of the tragedy that was Theia. However, more recent theories indicate that our planet suffered from several giant collisions during its formation, with the lunar-forming crash being the last great grand finale event.
Following that last giant impact, Earth put on some weight, but this new weight gain was derived from impacts of much smaller bodies, only about the size of asteroids like Vesta. Dr. Jacobson and his team used the later weight gain in order to determine when the unfortunate Theia struck.
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Earlier research had determined the quantity of material accreted onto the ancient Earth following the Moon-forming collision. These previous calculations were based on how the siderophile or "iron-loving" elements such as platinum and iridium show a strong tendency to wander down into our planet's core. Following each giant impact that the primordial Earth experienced, these elements would have leached from Earth's mantle and bonded with iron-rich, heavy material that was destined to travel down, down, down into our planet's heart.
"Our model explains the diversity of these ice-rich moons and the evidence for their very active geology and dynamics. It also explains a puzzling fact about Titan, in that a giant impact would give it a high orbital eccentricity," Asphaug continued to explain to the press on October 18, 2012.
All New to Mother Earth. This new belt of cosmos that the Sun is going through is all new to Mother Earth. This yearly trek is not the same as last year's. It is quite an adventure, full of surprises, for her to adapt and of course for us as her inhabitants to adjust as well.