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agree, but in the long long run it will lean towards hotter as the sun changes phases. eventually earth will be a scorched rock without anyone's help. you hav
by autokad 9y ago
agree, but in the long long run it will lean towards hotter as the sun changes phases. eventually earth will be a scorched rock without anyone's help.
you have to consider, the earth is about 4.5 billion years old, and we only have 1 billion left, but life will be wiped out much 'sooner' then that.
- ezequiel-garzon 9y agoWhy does the Earth have one billion years left?
- Banthum 9y agoIn about a billion years the sun will exhaust enough nuclear fuel to cool and expand, boiling the oceans, blowing off our atmosphere, and turning Earth back into a sterile rock. It's predicted by astronomers and physicists who study stellar evolution.
- antisthenes 9y agoNo, that doesn't happen until 5 billion years into the future. The Sun will gradually keep getting hotter and slightly more luminous up to that point. Earth will be a desert long before the Sun exhausts nuclear fuel to start expanding and becoming a red giant.
- maze-le 9y agoAll stars become gradually hotter the older they get. G-type stars like our sun are no exception to this. On a certain point in time (currently estimated at 1Gy from now), the energy output of our sun is so big, that the Carbonate–silicate cycle[0] cannot continue uninterrupted. Thus CO2 and CO cannot be absorbed by the geosphere. The breaking of this process will gradually enrich the atmosphere with CO2, leading to a runaway greenhouse effect (a bit like on Venus). But I would not worry about that. It took 500My for life to evolve from trilobites to humans. This timespan is twice as long... [0]: https://en.wikipedia.org/wiki/Carbonate%E2%80%93silicate_cycle https://en.wikipedia.org/wiki/Carbonate%E2%80%93silicate_cyc...
- jsjohnst 9y ago> we only have 1 billion left Not disputing, but have a source for that theory?