Earth-like Planet Super super earths far more common than originally thought Super Earth-like Planet
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Interesting facts about space.
Oxygen isotopes on the Earth and Moon measure the same according to the specimens gathered from the Moon, meaning that the Earth and Moon did indeed form at the same distance from the Sun. Finding a theory that could satisfy all three of these specific facts would prove to be rather difficult. There have been three major theories about how the moon was created that have been discounted. Below we will discover what each of these three theories proposed and why they were deemed to be unlikely or impossible. The Fission Theory. The Fission Theory proposes that the Moon was created in the early history of our solar system when something caused the Earth to break apart and a large part of the Earth was cast into space which eventually formed into the Moon. This idea supported the fact that the Earth and Moon share similar mantles, but where this theory falls apart involves the actual physics it would take to create such a scenario. The amount of angular momentum and energy required to create this situation would make the current placement of the Earth and Moon next to impossible. Thus, the fission theory has been deemed incorrect. The Capture Theory. The Capture Theory contends that the Moon came to be obtained by the Earth after it formed in a different location in the solar system, shedding light on the Moon's different composition. There are a couple problems with this scenario. Since we know that the Earth and Moon have the same oxygen isotopes on their surfaces, therefore meaning they would have the same amount of baking from the Sun, it doesn't explain how the Moon would have encountered the extra baking on its surface. The physics behind this call for a lot of specific things to happen, such as the Moon entering Earth's gravitational speed at just the right speed, at just the right distance to allow for the current set-up. Not only would it have to approach the Earth with these two requirements, but there would also have to be something that could slow the Moon down., however, capture into the Moon's present orbit is very improbable. Something would have to slow it down with just the right gravitational pull to cause the Moon to fall into Earth's orbit. While complicated, this could have been possible, but it is very unlikely. The Co-Formation Theory.
and here is another
Astronomers' current understanding of giant-planet birth predicts an episode of gas accretion that ultimately builds up the enormous size of these gaseous behemoths. According to theory, circumplanetary gas disks, that surround the forming planets during this early period, eventually become the strange nurseries that produce a giant planet's system of moons, thus creating systems of co-planar and prograde (orbiting in the same direction as the planet) natural satellites in a way similar to the many moons of Jupiter and Saturn.
Triton was the second moon in our Solar System that was found to have a substantial atmosphere, which is primarily composed of nitrogen--with smaller quantities of carbon monoxide and methane. Discovered by William Lassell in 1846, only seventeen days after the discovery of Neptune, Triton is one of the most frigid worlds in our Solar System, with a surface temperature of only about 38 Kelvin. Triton's frozen surface is coated by nitrogen, carbon dioxide, methane, and water ices, and it has a high geometric albedo of more than 70%. Surface features include a large southern polar cap, ancient cratered planes that are cross-cut by scarps and graben, as well as much younger features thought to have been formed by endogenic processes like cryovolcanism (ice volcanoes).
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Dr. Alice Le Gall commented in the same JPL Press Release that "Before Cassini, we expected to find that Ligeia Mare would be mostly made up of ethane, which is produced in abundance in the atmosphere when sunlight breaks methane molecules apart. Instead, this sea is predominantly made of pure methane." Dr. Le Gall, a Cassini radar team associate, is of the French research laboratory LATMOS, in Paris, and lead author of the new study.
The most detailed pictures of Europa show even more intriguing clues that there is slush lurking beneath its brightly shining icy surface. Slightly smaller than Earth's own beloved Moon, Europa's surface temperature could easily freeze an ocean solid over a span of only several million years. However, some astronomers think that warmth from a game of tidal tug-of-war between Europa and Jupiter, as well as other neighboring moons, could be keeping large regions of Europa's subsurface global ocean in a life-friendly liquid state. This process is termed tidal heating, and it refers to a mechanism whereby the gravitational tugs of a nearby object (or objects) flex and bend and contract and expand another object continually. This constant churning causes the victimized object, in this case Europa, to heat up and be considerably more balmy than its great distance from the Sun would otherwise allow it to be.
JAXA has announced a space mission scheduled to begin in 2022, with an expected return to Earth in 2026. "Its objective is to carry out close-up remote sensing and in-situ observations of both Phobos and Deimos, and to bring back samples from Phobos," commented Dr. Ryuki Hyodo in the July 4, 2016 CNRS Press Release. Dr. Hyodo is a planetary scientist, originally from Kobe University in Japan, and he is also currently collaborating with the IPG. "High-resolution impact simulations are still needed to understand more about the disk structure," he continued to explain to the press.