74 books
—
7 voters
Astrophysics
“
Physical life is not fluid. It will not and cannot adjust to any old universe. The fine-tuning that astronomers observe indicates that even very slight alterations to the universe's characteristics would rule out the possible existence of physical life.
...more
”
― Designed to the Core
― Designed to the Core
“
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
...more
”
― Designed to the Core
― Designed to the Core
A Goodreads version of Cloudy Nights. Some book reviews and some astronomy and astrophotography.…more
4 members,
last active 3 years ago
Where fans of scientist, skeptic, author & educator Carl Sagan can discuss all things Sagan rela…more
35 members,
last active 11 years ago
This group is for Space lovers and and astronomy lovers .....Discussions about space and ideas a…more
288 members,
last active 10 months ago
If you are most often found holed up in your Atlanta home reading the latest on anything from qu…more
45 members,
last active 5 years ago
