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Nasa warns of threat from space

When the earth was hit by an 11,000-ton ”stone” from space on 18 February 2013 injured about 1,200 people. And it came without warning.

the u.s. space agency Nasa, Jim Bridenstine, that this may happen again.

" this is not Hollywood. It's not about the movies. It is ultimately about protecting the only planet we currently know has life, " said Bridenstine in a speech in Washington D. C. on Monday.

The rymdsten that went into the earth's atmosphere over the Russian city Chelyabinsk in 2013 was great as a Londonbuss. And even if it does not injured someone on the ground was the blast after the so strong that buildings collapsed.

And the window shattered.

most of the injured suffered their injuries. Ljudbangen which came a long while after the bright meteor had been struck down, crushed by the thousands of panes where the curious stood and looked to see what had happened.

Many people had to glassplittret straight in the face.

in Addition to all the injured collapsed, parts of a brick building in Chelyabinsk.

Now, the point Nasachefen that this can happen again.

"I wish I could say that these events are unique, but they are not," said Bridenstine before a conference, write CNN.

took place on 30 June 1908, when another rymdsten, just as unexpectedly as in 2013, entered the atmosphere over Tunguska in Siberia and felled trees over an area the size of half the island of Gotland.

The time was injured no humans but the shockwave from the explosion threw the people who were many miles from the place to the ground.

Less rymdstenar is much more common and lit up the sky over Sweden several times a year.

bolid, passed over an area between lake Vättern and lake Vänern, between Mariestad, Laxå, at 22.14 on 29 april and was captured on several cameras that monitor the sky. One of them as far away as in eastern Norway.

Uppsala university, sweden, who runs several cameras that monitor the sky, noting that eyewitnesses describe it as a greenish eldkula which eventually split up in five to eight parts, after having shone in five seconds.

the Picture above shows boliden photographed by one of the university cameras that are placed at Örebro.

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