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Originally posted by Netchicken
I have read that underneath the Sahara are massive lakes of water. - no kidding...
Originally posted by whita
Also along the same lines, ancient Vedic (hope I have that right) writing suggests a desciption of a nuclear attack in ancient India. About the same time that the ancient Indian rulers were flying around in their vimanas.
Originally posted by spangbr
would a ground penetrating radar be able to pass through the sand and detect more solid objects below?
From Spaceguard UK: Largest ever field of impact craters uncovered
The discovery of the largest field of impact craters ever uncovered on Earth is the first evidence that the planet suffered simultaneous meteor impacts in the recent past. The field has gone unnoticed until now because it is partially buried beneath the sands of the Sahara desert in south-west Egypt.
The structures turned out to be part of a huge field of 100 craters spread over 5000 square kilometres near the Gilf Kebir plateau. The craters vary in diameter from 20 metres to 2 kilometres across. The previous largest known crater field covers a mere 60 square kilometres in Argentina.
In February, Paillou led a joint Egyptian and French mission to find the site and examined 13 of the craters, confirming that they were the result of simultaneous impacts. But accurately dating the field has been tricky. Paillou estimates that it is roughly 50 million years old, relatively young in geological terms.
ATTA has now been used to count krypton-81 atoms in groundwater samples in the ancient waters of the Sahara. Kr-81 (half life=229,000 years) is a rare isotope produced by the cosmic rays in the atmosphere, and accompanies more common forms of atmospheric krypton.
Trapped in water underneath the Sahara, the abundance of Kr-81 relative to other Kr isotopes provides information on how long the water has been there. Extracting krypton from the Nubian aquifer in the western Sahara, and using the ATTA technique, the researchers found that the water's age ranges from 200,000 to a million years old, depending upon the sample location.