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A little interesting about space life.
"Pluto will continue to surprise us when New Horizons flies past it in July (2015). Our work with Hubble just gives us a foretaste of what's in store," Dr. Showalter commented to the press on June 3, 2015.
and here is another
Europa, is a fascinating, frigid little world. It is one of the four Galilean moons, discovered in January 1610 by the great Galileo Galilei when he was gazing up into the night sky with his small, primitive "spyglass". The other Galilean moons, the weird sisters of Europa, are Io, Ganymede, and Callisto.
In addition to the Giant Impact theory, there are several other models that have been proposed to explain how our Moon was born. One alternative model to the Giant Impact scenario suggests that Earth's Moon was once a part of our planet that simply budded off when our Solar System was in its infancy--approximately 4.5 billion years ago. According to this model, the Pacific Ocean basin would be the most likely cradle for lunar birth. A second model proposes that our Moon was really born elsewhere in our Solar System and, like the duo of tiny potato-shaped Martian moons, was eventually snared by the gravitational tug of a major planet. A third theory postulates that both Earth and Moon were born at about the same time from the same protoplanetary accretion disk, composed of gas and dust, from which our Sun's family of planets, moons, and smaller objects ultimately emerged.
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The scientists modeled different temperatures and water abundances that may have been present in the Moon-birthing disk. At higher temperatures, their disk was primarily composed of silicate vapor, which formed as a result of evaporation of the mantles of both the proto-Earth and the doomed Theia. The disk at these higher temperatures also contained a relatively small quantity of hydrogen dissociated from water. In contrast, at lower temperatures, their disk was primarily composed of water, from which hydrogen did not dissociate under this cooler temperature range--thus making its escape mechanism very inefficient.
Because the lunar atmosphere is very thin, it is far too sparse to prevent a steady shower of impacts from tumbling asteroids, comets, and meteoroids. These objects strike the lunar surface, leaving behind numerous crater scars. For example, Tycho Crater is over 52 miles wide.
"How can this be? Is it just a matter of size? Location? What about Mercury and Venus? Did they grow on similar timescales to the Earth or on timescales more similar to Mars? I think these are some of the really important questions that we, as a community of planetary scientists, will be addressing in the future," Dr. Jacobson told the press in April 2014.