22 votes

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth? No. The smallest possible velocity is about 11 km/s velocity, and that would require a near miracle. For that to happen, the ...
David Hammen's user avatar
  • 23.6k
21 votes

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

I'm gonna sail against the wind and say "yes", indirectly. Although you don't need a cold asteroid, a "normal" one would suffice. When striking the Earth, asteroids eject a large ...
Jean-Marie Prival's user avatar
21 votes

If the Bennu asteroid were to hit within a 500 mile radius of Yellowstone National Park, will it trigger a super volcano at Yellowstone?

There is actually an hypothesis that large asteroid impacts can trigger volcanism at the antipodal point, where the seismic energy of the impact focuses. On Earth, it has been suggested that the ...
Jean-Marie Prival's user avatar
17 votes
Accepted

If the Bennu asteroid were to hit within a 500 mile radius of Yellowstone National Park, will it trigger a super volcano at Yellowstone?

Maybe but it will depend on the state of the magma chamber under the caldera. If the magma chamber is already under enough pressure and has a super-eruptive quantity of liquid melt in it then the ...
Ash's user avatar
  • 4,260
13 votes

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

No, it's not possible to cool the Earth with an asteroid impact. The mass of any asteroid that could hit the Earth is far too small to be a heat sink. The asteroid that killed the dinosaurs had a ...
gerrit's user avatar
  • 11.7k
12 votes

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

For your purpose (energy in the entire system) it doesn't matter if the asteroid lands gently or not because energy is conserved: If the asteroid slows through some kind of atmospheric braking, then ...
user3067860's user avatar
9 votes

If the Bennu asteroid were to hit within a 500 mile radius of Yellowstone National Park, will it trigger a super volcano at Yellowstone?

Bennu is about 470m diameter, and will impact at a "mere" 11.3km/s. At the impact site it would blast a crater some 3 miles wide and 1500 ft deep, a very respectable impact indeed. The ...
PcMan's user avatar
  • 191
7 votes
Accepted

If superheavy elements existed in the solar system, why wouldn't we find them on earth?

The most likely explanation for the lack of those superheavy elements on Earth is that those elements don't exist in that asteroid. The very high mass and hence very high density estimation of 33 ...
David Hammen's user avatar
  • 23.6k
5 votes

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

One asteroid or comet, no. Even it it was huge you might get a planetary extinction event like the meteorite that crashed into the Yucatan region resulting in the dinosaurs dying out. That would be ...
Fred's user avatar
  • 24.7k
4 votes

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

Thermodynamically No Jean-Marie gives a good answer about aerosol effects. Others observe that impacts add energy to the planet. I would simply like to look at the energy budget. The sun dumps on ...
Lawnmower Man's user avatar
4 votes

Would a gold-containing meteor cause it to "rain" gold?

As it melted, it would be broken up into a spray or even a mist by the airstream. The droplets would quickly slow down to their terminal velocity and solidify, so you would get a fine gold dust ...
Mark Foskey's user avatar
4 votes

Luis Alvarez's K-T Impactor Calculation

The volume of a sphere is $\small\sf{\frac4 3\pi R^3}$, where $\small\sf{R}$ is the radius. The volume of Earth with the 4 cm deep iridium rich layer is, $\small\sf{V_{Ei} = \frac 4 3\pi (6.378\...
Fred's user avatar
  • 24.7k
3 votes

How deep could the Vredefort asteroid have penetrated?

10–16 km there is an interesting equation that demonstrates an rocky impactor hitting rock does not penetrate further than its diameter. Basically because a meteorite and the rock it hits have ...
John's user avatar
  • 6,891
3 votes

Original Diameter of Ancient Impact Craters

When comparing the sizes of the two craters, you are confusing how erosion works. Erosion did not shrink the original crater to from 43 miles to 430 meters. The crater was 43 miles across and was ...
Wolfgang Bangerth's user avatar
3 votes

Would a gold-containing meteor cause it to "rain" gold?

Would a gold-containing meteor cause it to “rain” gold? No. First, it is a bit unclear what do you mean by "gold-containing meteor". All solar system bodies have gold, the question is how ...
Gimelist's user avatar
  • 23.1k
2 votes

Is there any research on the relation of asteroid impacts and hot-spots?

This question has been researched for decades. Here are two examples of such studies (you can find more by looking at articles citing those two). In Assessment of Antipodal-Impact Terrains on Mars, ...
Jean-Marie Prival's user avatar
1 vote

Could an icy/extremely-cold asteroid/comet ever strike and cool the Earth?

Impacts typically occur at a range of 20 to 70 km/s. Let's look at the 20 km/s one. 1 kg of mass at 20 km/s = 1kg * 20,000 m/s * 20,000m/s /2 = 200 million joules. To bring ice from absolute zero to ...
Sherwood Botsford's user avatar

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