Pieces of stone or metal falling from space, made visible for part of their journey due to intense frictional heating.

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Distribution of Kinetic energy after an Impact

How does the huge amount of kinetic energy of some fast object like a meteor or rocket etc. gets distributed into various kinds of energy like kinetic, sound, light etc after making an impact with ...
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0answers
79 views

How fast do large asteroids usually travel?

I have just watched this video made by discovery channel, and you can hear the narrator at 0:51 saying that : "even though it is moving at 720 THOUSANDS kilometers per hour..." I stopped once I heard ...
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3answers
246 views

Why do meteors explode?

A report on the Chelyabinsk meteor event earlier this year states Russian meteor blast injures at least 1,000 people, authorities say My question is Why do meteors explode? Do all meteors ...
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2answers
99 views

What processes occur when a meteor enters the atmosphere?

What processes occur when a meteor enters earth's atmosphere and then what will be speed of meteor when it encounters air resistance?
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2answers
69 views

What information about a meteor's trajectory, size, or height can be derived from a single location?

If one sees a meteor, is there any way to get even a rough approximation of its height, entry angle, size, or other characteristic without triangulation from another position? If it appeared as a ...
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2answers
88 views

meteor explosion, steam or shock/vibration trigger

Is the explosion of a meteor due to forces imparted to the meteor by entry into atmosphere, or is it due to heating of a meteor that contains water with conversion to steam triggering the explosion? ...
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2answers
131 views

energy of Russian meteor, does it matter whether it explodes or not?

The kinetic energy calculation for any meteor would be the traditional one half times the mass times the velocity squared. In terms of the events that occur on the ground, does it matter whether the ...
44
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2answers
7k views

Was the 2013 meteor over Russia stronger than an atomic bomb?

Reports of the Russian meteor event (2013) say that it released more energy than 20 atomic bombs of the size dropped on Hiroshima, Japan: Scientists estimated the meteor unleashed a force 20 times ...
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3answers
1k views

2013 Russian meteor event, Sonic Boom or Explosion Boom?

In the lastest meteor event in Russia there was a big BOOM heard long after the meteor had passed. In this youtube video we can see at 4:30 the Meteor passing.. then hearing the BOOM at 7:00 , 150 ...
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4answers
4k views

After what speed air friction starts to heat up an object?

I understand that air friction cools off an object at low speeds. For example, if you blow on a spoon of hot soup, it cools off. Or if you swing a hot frying pan in the air, it cools off faster. But ...
7
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4answers
3k views

Comet versus asteroids versus meteors

What are the differences between Comet versus asteroids versus meteors in practical terms?
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1answer
12 views

Are there trends in the number of meteors in a shower year on year?

Some years the Leonids are amazing, other years there are very few - are these predictable at all, following trends or at least reasonably accurate predictions?
7
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3answers
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Are there any Earth-Meteorites on Earth?

A follow-on from this question, if meteorites can come from Mars, it seems they could have come from Earth and ended up back here (though I'm guessing that to be less likely). Do we have any evidence ...
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2answers
553 views

Are meteorites igneous, sedimentary or metamorphic rocks?

Are meteorites igneous, sedimentary or metamorphic rocks? Or do we need a new method of rock classification for them?
2
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1answer
20 views

Is there any way to judge whether a bolide might produce a meteorite?

If you see a bolide, is there any way to judge whether it's worthwhile to try to find an impact? (I mean, short of a big "bang" and a debris cloud rising from the remains of your car...) I imagine ...
2
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2answers
214 views

Why can't you see meteors, but you can see comets from the moon?

Why can't you see meteors from the moon and why can you see comets?
10
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4answers
95 views

What's the best way to watch meteor showers?

I have read somewhere that the best/easiest way to watch meteor showers is to lie on the ground or other horizontal surface with your feet oriented towards the "apparent point of origin" (what was ...
12
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3answers
72 views

Which is the strongest meteor shower expected in the next years in the Northern hemisphere?

Which is the strongest meteor shower expected in the next years in the Northern hemisphere? Is it possible to give good predictions for this?