If you were to step back in time some 365 million years, you might see a landscape more akin to the wilder shores of science fiction than earthly reality. Imagine a forest made up only of one kind of tree. A thin, straight, ...
Archaeology
Aug 9, 2019
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143
The presence of water on ancient Mars is a paradox. There's plenty of geographical evidence that rivers periodically flowed across the planet's surface. Yet in the time period when these waters are supposed to have run—three ...
Space Exploration
Jan 24, 2017
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607
(PhysOrg.com) -- The gases which formed the Earth's atmosphere - and probably its oceans - did not come from inside the Earth but from outer space, according to a study by University of Manchester and University of Houston ...
Earth Sciences
Dec 10, 2009
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1
When NASA's Mars rovers found manganese oxides in rocks in the Gale and Endeavor craters on Mars in 2014, the discovery sparked some scientists to suggest that the red planet might have once had more oxygen in its atmosphere ...
Planetary Sciences
Dec 22, 2022
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388
Tiny meteorites no larger than grains of sand hold new clues about the atmosphere on ancient Earth, according to scientists.
Earth Sciences
Jan 30, 2020
2
794
Today's atmosphere likely bears little trace of its primordial self: Geochemical evidence suggests that Earth's atmosphere may have been completely obliterated at least twice since its formation more than 4 billion years ...
Space Exploration
Dec 2, 2014
3
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(Phys.org)—Multicellularity in cyanobacteria originated before 2.4 billion years ago and is associated with the accumulation of atmospheric oxygen, subsequently enabling the evolution of aerobic life, as we know it today, ...
Earth Sciences
Jan 16, 2013
2
1
Carbon and nitrogen are central to life on Earth – life cannot exist without them, but an overabundance in the atmosphere imperils the life we have. So how much carbon and nitrogen is there on (and in) planet Earth? And ...
Earth Sciences
Nov 29, 2016
0
14
The habitability of a planet depends on many factors. One is the existence of a strong and long-lived magnetic field. These fields are generated thousands of kilometers below the planet's surface in its liquid core and extend ...
Space Exploration
Oct 15, 2020
2
54
In a first-of-its-kind study, a research team, including Northwestern University's Brian Hoffman and Ajay Sharma, found that ancient bacteria could survive close to the surface on Mars much longer than previously assumed. ...
Astrobiology
Oct 25, 2022
2
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