12 books
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12 voters
Astrophysics
“
Like the Great Oxidation Event, the Great Unconformity injected an enormous quantity of oxygen into the atmosphere through a massive and efficient subduction of organic carbon into Earth's mantle. When this event occurred, the oxygen quantity in Earth's atmosphere jumped from 1% or less up to 8%. Just before the time of the Cambrian explosion 543 million years ago, another major continental erosion event coupled with oceanic sediment subduction led to a jump in the atmosphere oxygen level from 8
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”
― Designed to the Core
― Designed to the Core
“
Just as the interior structure of our supercluster of galaxies, our galaxy cluster, our galaxy, our local galactic neighborhood, our star, our system of planets, asteroids, and comets, and our Moon differ from the normal pattern in precise ways that favor the possibility of advanced life on Earth, so, too, does Earth's core.
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”
― Designed to the Core
― Designed to the Core
Where fans of scientist, skeptic, author & educator Carl Sagan can discuss all things Sagan rela…more
35 members,
last active 11 years ago
A Goodreads version of Cloudy Nights. Some book reviews and some astronomy and astrophotography.…more
4 members,
last active 2 years ago
This group is for Space lovers and and astronomy lovers .....Discussions about space and ideas a…more
286 members,
last active 7 months ago
This global discussion group has been designed to encourage debates about important and underrep…more
23,660 members,
last active a day ago
