One of the biggest mysteries about planets is how water appears on Earth. Back in the time when our planet was formed 4.5 billion years ago, the heat from the Sun caused most of the solar system's water to be swept away. Water is almost there, frozen, crept in other forms of material, in Saturn's halo, Jupiter's moon, Neptune, Uranus and billions of other stars. .
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But the Earth also has a large amount of water, scientists have wondered for years about how water appears on Earth. One theory is that water was formed from the mass landing of comets towards the Sun over a period of half a billion years after the Earth was formed . This idea received great agreement with the discovery that, at least there are a few stars, with the same chemical sign of the existence of water on Earth.
When this information is still so new, astronomers have found other new evidence to reinforce this theory - and it happened 400 trillion miles ago. More precisely, comets from Eta Corvi, a very bright star in the northern hemisphere, said Johns Hopkins, lead researcher Carey Lisse, 'We have observed a stellar rain. The original broom landed near this star. " What Lisse and his colleagues discovered was also described in an upcoming Astronomical Journal article , an infrared sign of dust particles. at a distance of three astronomical units - three times the distance from the Earth to the Sun - calculated from the central star, detailed testing of this dust with the Spitzer Space infrared telescope shows that they form words Very strong collisions between extremely large meteors.
'We see the amorphous carbon molecules and amorphous silica,' Lisse said, 'they show that comets have collided with extremely large objects, at least equivalent to Ceres and may be several times the size of the Earth ' . If these comets stabbed each other, Lisse said that there might be more big collisions happening. This observation has not reached any conclusion, Lisse admits that, instead of a small shower of comets, he may be seeing fragments from a larger star 'We are not completely sure. ' He said: ' All we know is that a lot of debris is floating around. '
Not all debris attracts Lisse and his colleagues' attention, but only specific pieces of debris, including ice-water particles and organic chemicals - things that people often know about them. Comet dust. There, the chemical signs of the dust-like Almahata Sitta met with Sudan in 2008, and the star formed in the Kuiper belt away from Neptune, where billions of stars not yet exposed (such as the 'dwarfs' Pluto and Sao Eris, which are essentially giant comets).
Connecting it all together, you will see the reality of the process of forming water on Earth, which has brought us life, billions of years after the Solar System was formed. Because the Eta Corvi system is billions of years old, a big question is always wondered: is there life here or not? Initially, the answer may be no, because the planets where the comets hit are far from Mars, in orbit where water may freeze. In our Solar System it is obvious. However, the Eta Corvi is much brighter than the Sun, so its habitat, where signs of water to sustain life can exist very far. Another big question is whether or not there is evidence of comet rains - the right conditions for life - in a weak solar system. Actually not yet.
"We have observed thousands of stars," Lisse said, " and this is the only star with such conditions ." However, that does not mean that other places do not exist, he added. 'Currently, everything is still in mystery' . The James Webb Space Telescope will be officially put into use in early 2018 if Congress passes, the device will be more responsive and may show many clues. In other words, it is too early to conclude that life on earth is made possible by accidental contact.