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[Pravada] Comet could collide with Mars in 2014 with the force of 20 billion megatons of TNT - Page 18

post #171 of 216
Quote:
Originally Posted by BenC View Post

Might want to revise your statement. Meteorites originating from Mars are not unheard of. To originate from Mars these objects had to have been ejected by an impact. The point here is that the object being ejected need to reach a point in space where the force of gravity exerted by the mass of the planet is zero. An object that can purportedly excavate a 500km diameter crater would have no difficulty ejecting material into space.

It is absolutely possible for an object to enter the atmosphere of a planet and still escape that planet's gravity well. There is quite a bit of speculation with regards to terraforming regarding atmospheric thickening by skipping multiple comets off a planet's atmosphere or into the planet itself.

Edit: Typo.
I was only considering anything large enough to worry about like a "chunk of mars" big enough to do anything with. Largest Mars Meteroite that we've found made a hole all of 2 ft deep...

As for the skipping, I think you linked the wrong lecture, both mentions of comets are about crashing them into the planet, and the word skipping (also looked for bouncing) was no where to be found.
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post #172 of 216
The atmosphere link explains the concept of bouncing.

http://science.nasa.gov/science-news/science-at-nasa/2011/16dec_cometlovejoy/

Recent passage of a comet through an atmosphere, the sun in this case.
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post #173 of 216
Quote:
Originally Posted by BenC View Post

The atmosphere link explains the concept of bouncing.

http://science.nasa.gov/science-news/science-at-nasa/2011/16dec_cometlovejoy/

Recent passage of a comet through an atmosphere, the sun in this case.
Physics of a structurally unstable comet are a bit different than a space shuttle, but I would point out that I was talking about leaving atmosphere with enough left to leave orbit and impact Earth, which is significantly harder. Note that Lovejoy is in orbit around the sun, and is estimated to have been 500+m large to have survived. Damn me for using shorthand on a forum biggrin.gif
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post #174 of 216
Quote:
Originally Posted by -Apocalypse- View Post

Physics of a structurally unstable comet are a bit different than a space shuttle, but I would point out that I was talking about leaving atmosphere with enough left to leave orbit and impact Earth, which is significantly harder. Note that Lovejoy is in orbit around the sun, and is estimated to have been 500+m large to have survived. Damn me for using shorthand on a forum biggrin.gif

Not trying to bust your balls, but your statement was misleading. And you are right, a comet is different than a space craft but the concept is proven and Lovejoy is a recent example.

Also note that everything in the solar system is in orbit around the Sun tonguesmiley.gif, I kid, I kid.

I am willing to bet this one is pretty big, or the estimates of energy released at impact are greatly exaggerated. Look at Shoemaker-levy and Jupiter. Even broken apart it left its mark for quite awhile, that takes a lot of energy.
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post #175 of 216
Quote:
Originally Posted by BlankName View Post

He's saying if the comet hits mars, it will cut out a huge crater in the planet. Which should dig up quite a few unknown minerals and what not that are below the surface of Mars.

that or pisses off some martian manhunters or starts the general plot of species 2 o.0

though i'm all for some new minerals that could do any number of crazy things or have insane hardness. only loss there would be curiosity not getting footage of the impact since i would think we would want it able to observe that for better or worse. also since if the comet does miss it should be in a prime spot to record the comet flying by which would be pretty sweet too.
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post #176 of 216
WOW!
post #177 of 216
Slight update.

Continuing with the trend, the current estimate has the nominal distance closer than it was when the OP article was written. At the time of the article, it was 0.0007 AU (~100,000km), now its 0.00035 AU. That's about 52,000km, and that's about 7x closer than the moon.

Good news is good biggrin.gif
Edited by doomlord52 - 3/4/13 at 2:12am
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post #178 of 216
Alright, I guess I'll be the one to ask this:

If this impact were to take place, would the explosion be visible from earth?

EDIT: By visible I mean with the naked eye.
Edited by Tman5293 - 3/4/13 at 2:49am
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post #179 of 216
Quote:
Originally Posted by Tman5293 View Post

Alright, I guess I'll be the one to ask this:

If this impact were to take place, would the explosion be visible from earth?

EDIT: By visible I mean with the naked eye.

Nope. At best, mars is just a faint red dot in the night sky. This would be a dot on the dot. While its possible that the impact will make mars brighter than it usually is, you won't be able to see any detail. IF you can see mars at all at the time of impact, the best case is that the dot gets slightly brighter for a bit.

Not really that rewarding :/

Best bet would be to get a telescope. You'd need a pretty decent one to see detail, but it's pretty much the only 'manual' way of seeing it live (Nasa should live-stream it, if they can).
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post #180 of 216
It would have to be visible from earth. just not to good by the naked eye.
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