Sentences with phrase «ago by a meteorite»
The researchers were looking at rocks from the Ries crater (inset) of southern Germany, a 24 - kilometer - wide depression formed about 14.6 million years ago by a meteorite crashing into Earth with the force of 1.8 million Hiroshima bombs.
http://www.sciencemag.org/ Not exact matches
Based on their analysis, Mars» metals are best explained by a massive meteorite collision about 4.43 billion years ago, followed by a long history of smaller impacts.
By studying the magnetic orientations in pristine samples of ancient meteorites that formed 4.563 billion years ago, the team determined that the solar nebula lasted around 3 to 4 million years.
A few years ago, spurred by chest pains and intimations of his mortality, Piatek decided to cut back on both his working hours and his meteorite addiction.
Discovered in 1984 in Allan Hills, Antarctica, researchers believe that meteorite ALH84001 struck Earth some 3.5 to four billion years ago after being kicked up from the Martian surface and into space by the impact of another meteorite.
It would even lend support to the recent and bizarre hypothesis that Earth might have been seeded, billions of years ago, by microbe - bearing Martian meteorites.
Everyone agrees it is one of a few dozen meteorites that we know came from Mars; it was bounced off that planet by a larger meteorite 16 million years ago and eventually fell onto the Antarctic ice.
Meteor Crater in Arizona, formed by a meteorite impact 50,000 years ago, contains bits of a hard, compressed form of silica called stishovite.
In contrast, the meteorite analyzed by Lapen's research team was formed 2.4 billion years ago and suggests that it was ejected from one of the longest - lived volcanic centers in the solar system.
By coincidence, the meteorite fell in the same area that prospectors flocked to more than 150 years ago during California's gold rush — and it has attracted prospectors of its own.
Geologists believe it started life, 4 billion years ago, tens of metres below the Martian surface and was «snookered» off the planet by another meteorite when it struck that area, a mere 16 million years ago.
D - and L - amino acids were separated in meteorites ~ 5 Gyr ago probably by circular polarized light from a pulsar, before life began: http://144.206.159.178/ft/402/10643/204793.pdf