Alternative History

though Shoemaker-Levy 9 turning is a nice variation of the comet-hits earth scenario... and btw resembles Deep Impact... IMO, this TL is nearly completely implausible(if it is meant seriously.

  • Hard to imagine shelters for 4+ billion !! people being built within a year...look at "Deep-impact"
  • laughter!!????THE MOON is moved by a comet??? explain please:) DECIMATING one SHELTER????? HAHAHA . If the WHOLE moon hits us... GOODBYE EARTH!!! broken into pieces...--Xi'Reney 19:38, 22 July 2009 (UTC)
I will agree that the building of shelters for 4 billion wouldn't happen, couldn't happen from a purely logistical stand point. And the moon wouldn't be displaced by a comet. The moon's mass vastly outweighs the WHOLE of Shoemaker-Levy, by a factor of 100 or so. HUGE difference. Louisiannan 19:42, 22 July 2009 (UTC)

Ok, more serious discussion:

Astronomically difficult to explain

  1. SL9 not bursting into 21 pieces...
  2. Even if you leave out the Moon being moved:

Explain that much of Earth surviving this impact of 21 pieces: See description below of the consequences on Jupiter (from wikipedia): "In July 1992 the orbit of Shoemaker-Levy 9 passed within Jupiter's Roche limit, and Jupiter's tidal forces acted to pull the comet apart. SL9 was later observed as a series of fragments ranging up to 2 km (1.2 mi) in diameter. These fragments collided with Jupiter's southern hemisphere between July 16 and July 22, 1994, at a speed of approximately 60 km/s (37 mi/s). The prominent scars from the impacts were more easily visible than the Great Red Spot and persisted for many months."--Xi'Reney 19:47, 22 July 2009 (UTC)

Add to that the following from Wikipedia:Impact Event:
"Small objects frequently impact Earth. There is an inverse relationship between the size of the object and the frequency that such objects hit the earth. Asteroids with a 1 km diameter impact the Earth every 500,000 years on average.[1] Large collisions with five kilometer objects happen approximately once every ten million years. The last known impact of an object of 10 km or more in diameter was at the Cretaceous-Tertiary extinction event 65 million years ago. Asteroids with diameters of 5-10 m impact the Earth's atmosphere approximately once per year, with as much energy as Little Boy, the atomic bomb dropped on Hiroshima, approximately 15 kilotonnes of TNT. These ordinarily explode in the upper atmosphere, and most or all of the solids are vaporized.[2] Objects of diameters of over 50 meters strike the Earth approximately once every thousand years, producing explosions comparable to the one observed at Tunguska in 1908.[3] At least one known asteroid with a diameter of over 1 km, (29075) 1950 DA, has a calculated probability of colliding with Earth in March 2880, with a Torino scale rating of two.
Throughout recorded history, hundreds of minor impact events (and exploding bolides) have been reported, with some occurrences causing deaths, injuries, property damage, or other significant localised consequences."
Scientists have also researched the Great Chicago Fire and suspect that this (and other mysterious fires started that same night) were caused by the impact of a cometary body that exploded in the air, much like the Tunguska event.
The point is, 21 impacts of 2 km or less would absolutely devastate the Earth. Some wouldn't devastate it, some would burn up in the air, and some would fortunately (?) be blocked by the Moon, although there is the possibility of further strikes from bits of the Moon blown out into space, but, frankly, these would be the last of anyone's worries...if anyone was left alive. Louisiannan 21:19, 22 July 2009 (UTC)

if the moon hit London europe would be a massive smoking hole, that is if the earth itself wasn't broken apart--Smoggy80 20:34, March 10, 2010 (UTC)

I would like to adopt this article and change it to be more plausible.

-Crimson Assassin

Then actually go through the adoption protocol, like everyone else. If you only post here, then you're not going to adopt it. Lordganon 02:48, June 28, 2011 (UTC)