Solar System Grade 4 solar system grade 4 4 System Solar Grade

Solar System Grade 4 solar system grade 4 4 System Solar Grade

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Gravity can pull binary systems apart when the sister objects travel too close to a massive body--such as the planet Neptune. The orbital motions of the two sister objects results in one member traveling slower than the other. This can disrupt the system and permanently alter the orbital companion. This mechanism is termed an exchange reaction, and it could have shot Triton into a number of different orbits around Neptune, Agnor continued.

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During the 2013 experiment, the radar instrument spotted echoes emanating from the seafloor and determined the depth of Ligeia Mare along Cassini's track over that strange methane sea. This represented the first-ever detection of the bottom of an extraterrestrial sea. The astronomers were amazed to find that depths in this distant, alien sea were as great as 525 feet at the deepest point along the track the radar pointed.

and finally

Although Europa was visited by the two spacecraft Pioneer 10 and Pioneer 11 in the early 1970s, and the twin Voyagers in 1979, these early flybys only produced grainy, dim images. However, these early pictures revealed enough about the little moon to make it intriguing. Pale yellow icy plains were seen in the Voyager images. The plains also tantalizingly displayed red and brown mottled areas. Long cracks were observed, running for thousands of miles over the shattered eggshell-like crust. On Earth, similar cracks would suggest such features as high mountains and deep canyons. But nothing higher than a few kilometers was seen on the moon. In fact, Europa is one of the smoothest bodies in our Solar System.

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Some of the images focus on the shallow center of a bizarre impact crater dubbed Pwyll. Impact rays and shattered pieces of material scattered over an immense area of the moon tell the tale of a sizeable meteorite that collided violently with Europa relatively recently--"only" about 10 to 100 million years ago. There is also darker debris chaotically scattered around Pwyll. This further suggests that the large crashing meteorite may have dug up some deeply buried material, and tossed it helter-skelter around the crater.

In a study released in November 2011, Dr. Blankenship and his colleagues discovered the enormous subsurface lake on Europa by carefully scrutinizing two bumpy, circular features in the old Galileo images, taken about a decade earlier. The "chaos terrains" were shown to be bizarre regions of floating and colliding icebergs and ice flows. This jumbled mess collapsed portions of the little moon's ice shelf.

The current study's Franco-Belgian-Japanese collaboration looks forward to this mission. JAXA plans to enlist them to conduct tests on the Martian samples when they are returned to Earth. The samples will help the scientists determine whether Phobos is indeed made up of a mixture of Martian mantle and debris left in the wake of the tragic crash of the doomed, vanished protoplanet--as suggested by their supercomputer simulations.