How many megatons was the chixculub meteor impact equal to?

[Kutt]

How many megatons was the pre-historic chixculub meteor impact equal to?

This was estimated to be millions of times more powerful than the cumulative explosive power of all of the nuclear weapons in the world combined.

It caused the extinction of most life on Earth during that time (namely the dinosaurs) and even caused the oceans to evaporate. This meteor was about 6 miles in diameter.

If a 6-mile meteor is capable of doing that, imagine the kind of damage an asteroid the size of Texas could do.

 

[Jimmy Snyder]

If a 6-mile meteor is capable of doing that, imagine the kind of damage an asteroid the size of Texas could do.

If you think that's bad, imagine the kind of damage an asteroid the size of Alaska might cause.

 

[Kutt]

If you think that's bad, imagine the kind of damage an asteroid the size of Alaska might cause.

I thought that Texas was about as big as they get?

Apparently Mars was hit by a Texas-sized asteroid several billion years ago..

http://www.wired.com/wiredscience/2011/01/mars-dynamo-death/

 

[russ_watters]

Only in mediocre music-video-movies.

The largest near Earth asteroid (ie, in the asteroid belt) is much smaller, at 34 km: http://en.wikipedia.org/wiki/433_Eros

But other objects from the outer solar system can be much, much larger. Eris, for example, is more than 2000 km in diameter: http://en.wikipedia.org/wiki/Eris_(dwarf_planet )

 

[Kutt]

Only in mediocre music-video-movies.

The largest near Earth asteroid (ie, in the asteroid belt) is much smaller, at 34 km: http://en.wikipedia.org/wiki/433_Eros

But other objects from the outer solar system can be much, much larger. Eris, for example, is more than 2000 km in diameter: http://en.wikipedia.org/wiki/Eris_(dwarf_planet )

Supposedly, billions of years ago, Earth collided with a planet the size of Mars.

Somehow, the planet survived, and the fractured pieces of crust is what eventually formed the moon.

http://en.wikipedia.org/wiki/Giant_impact_hypothesis

 

[Ophiolite]

Supposedly, billions of years ago, Earth collided with a planet the size of Mars.
Somehow, the planet survived, and the fractured pieces of crust is what eventually formed the moon.

Just being picky, but the moon is composed primarily of mantle material from the proto-Earth, rather than crust. The impact hypothesis only became plausible after we had had the opportunity to examine the Apollo rocks.

 

[Nugatory]

How many megatons was the pre-historic chixculub meteor impact equal to?

Wikipedia says 100 teratons, which is 100,000,000 megatons. Wise people will do their own math instead of trusting wikipedia, so if you want give it a try...

One megaton is about 5x10¹⁵ Joules. The energy in Joules of the impact will be $\frac{mv^2}{2}$ where v is in meters/sec and m is in kilograms. Make some reasonable assumptions about the size, density, and speed of the meteor, and see what you come up with.

 

[Ophiolite]

One megaton is about 5x10¹⁵ Joules. The energy in Joules of the impact will be $\frac{mv^2}{2}$ where v is in meters/sec and m is in kilograms. Make some reasonable assumptions about the size, density, and speed of the meteor, and see what you come up with.

A serious disruption of test cricket.

 

[jim hardy]

Isn't there a simple equation relating crater size to kilotons?

http://www.convertalot.com/asteroid_impact_calculator.html