Tuesday, April 16, 2019, 20:30 – Based on the new study, there may be strange cliffs that rest at the bottom of the ocean off the coast of Papua New Guinea.
When the asteroid now known as "Oumuamua" was discovered in late 2017, astronomers identified it as the first entry interstellar visitor on our solar system. But, on the basis of the new study, in fact, the second is second.
"Oumuamua made a rather quiet entrance to our Solar System, as it slid and made a shot around the Sun. After that, they were spotted by telescopes while it was on the way back to the interstellar space.
According to the new paper by astronomers from Harvard, Amir Syraj and Avi Loeb, however, the real first registered instillary visitor to our solar system made a much brighter entry.
A meteor fireball flashed over Bismarck Sea, northeast of Papua New Guinea early morning on January 8, 2014, and was shot by sensors from the US government.
This map of all the reported balls from April 1988 to April 2019 captures what may be the first recorded interstellar weather strike on Earth. Credit: NASA Center for asteroid studies near Earth / Alan B. Chamberlain / JPL-Caltech
The impact was mostly unremarkable, compared with most strikes recorded on this map. Estimates of the size of meteors, on the basis of the energy of its impact, put it at about one meter wide, with a mass of slightly less than 500 kilograms (if it is a typical stone meteoroid).
However, by comparison, the impact of the Bering Sea from December 2018 was at least 1500 times more energetic, and the impact of Chelyabinsk in February 2013 was 4,000 times more energetic.
If anyone saw it, it would be very similar in the intensity of the fireball that flickered over British Columbia on September 4, 2017, as seen in the video of the video in all the sky below.
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What really set this firearm was how fast it was when he hit.
As it hit the top of the atmosphere, this meteoroid ranged about 45 kilometers per second, or 162,000 kilometers per hour. Of the 779 strokes discovered between 1988 and 2019, it is the second fastest on record. The fastest registration took place on July 4, 2015, over the Chinese province of Gansu, at a speed of 49 km / s.
A table of fireballs, sorted by speed, displays the two fastest balls on the record. Credit: NASA Center for asteroid studies near Earth
Following both of these meteorolls back from their impacts, Syray and Loeb found something remarkable.
The Gansu 2015 fireball might have been the fastest, but only because the Earth and the meteors hit each other in a head-on collision. Accordingly, its speed relative to the Sun was much slower, identifying it as a typical Dazinian of our Solar System (only one with a fairly extra trajectory when it reached the Earth).
Focusing on the Bismarck Sea fireball in January 2014, their analysis showed that this meteoroid was actually captured to the Earth, almost from behind the planet, during the impact. Thus, its speed relative to the Sun, before falling into the atmosphere, actually had to be faster than the velocity of the fireball – about 60 kilometers per second (216,000 km / h)!
The meteorite trajectory of January 8, 2014 (red), shown is cut with that of the Earth (blue) during the impact. Credit: Siraj, et al. (2019)
At a speed of 60 km / s, after "falling" this deep into the gravitational well of the Sun, they found it very unlikely that this object could be tied to the Sun. If it missed the Earth, it would have woken up around the Sun and would be ejected from our solar system, just like Osawoomai (traveling about 50 km / s while passing on Earth's orbit).
As a result of their analysis, Syray and Loeb said that the high speed of meteors in January 2014 means that it is probably taken out of the deep interior of a foreign planetary system, or perhaps close to a star, somewhere in the disc of our galaxy.
Finally, they recommend that meteor scientists analyze future high-speed impacts because they can have an interstellar meteoroid that will affect the Earth once every 10 years!
It would be immediately impossible to locate fragments of the meteorite from this effect, because they are very likely at the bottom of the ocean. However, finding meteorites from interstellar impact can be one of the greatest scientific discoveries of our time.
Sources: arXiv.org | NASA CNEES AMS meteors
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