My OperaNew Impact Crater found in Sahara
2006年3月5日日曜日9:42:35
A new huge impact crater has been found in the Saharan desert in Egypt
The crater is about 31 kilometres wide, more than twice as big as the next-largest Saharan crater known.
It may have been formed by a meteorite impact tens of millions of years ago with a diameter of roughly 1.2 km.
The Kebira Crater lies in the Western Desert on the northern tip of the Gilf Kebir region in southwestern Egypt, at the border with Libya. "Kebira" means "large" in Arabic.
Kebira's shape is reminiscent of the many double-ringed craters on the Moon.
The crater is about 31 kilometres wide, more than twice as big as the next-largest Saharan crater known.
It may have been formed by a meteorite impact tens of millions of years ago with a diameter of roughly 1.2 km.
The Kebira Crater lies in the Western Desert on the northern tip of the Gilf Kebir region in southwestern Egypt, at the border with Libya. "Kebira" means "large" in Arabic.
Kebira's shape is reminiscent of the many double-ringed craters on the Moon.
- http://www.msnbc.msn.com/id/11658245/
- http://www.eurekalert.org/pub_releases/2006-03/bu-lci030306.php
You must be 
DecimusMackay # 2008年2月28日木曜日21:21:10
Are these huge craters really caused by impacting asteroids? They are always so perfectly formed - yet some asteroids must impact at different angles to others. Surely it is becoming obvious to us that they are just sized up versions of the kimberlite inverted cones where diamonds are found? These were formed more than a billion years ago by powerful upthrusts of supercompressed carbon dioxide - see the video on De Beers website. The rim of the crater is compressed (metamorphosed) rock at the edge of the phenomenon. The flat floor of the crater has been refilled by much of the ejecta and also sediment from lakes which formed afterwards.
This theory seems more plausible - the more one thinks about it. All the craters on the Moon will have formed in just the same way.
I would be interested to hear your comment.
Regards Andrew Mackay
Ole Nielsennielsol # 2008年2月29日金曜日10:20:14
http://www.unb.ca/passc/ImpactDatabase/
These determining factors cannot possible be ascribed to kimberlites. Most known impact craters are much younger than your billions of years - with no root (pipe) downwards as you would have at a kimberlite. I have visited a few impact craters and seen absolute nothing to back your theory, on the contrary.
And, yes, extraterrestrial bodies impact at different angles. In many cases the impact angle has indeed been calculated.
Regards Ole