Scientists:>The Earth's temperature has always been able to maintain liquid water (be between 0°C - 100°C).Also scientists:>The Sun output 30% less energy 4 billion years ago and gradually increased over time.
>>16883102Yeah. Scientists are a bit confused by this too.https://en.wikipedia.org/wiki/Faint_young_Sun_paradox
>>16883116Great so the void will slowly fry us if I don't somehow pull a magical Dyson sphere out of my back pocket some time in the next billion years, good to know it was actually internally consistent.(ie., 'great filter')
>>16883124It do be that way.We either leave this rock or we die with it.
>>16883102I think because the core of the sun is locked in a time state between creating, the two intersecting circles would have the weight outside the sun organised for pro creation with the correctly balanced ratio to the Earth.
>>16883102>what is the greenhouse effectwow that was hard. next question?
>>16883102First of all I don't think the first statement is true or at least universally accepted claim since many believe that earth has gone trough 3 full or nearly full snowball earth phases where there would be no or nearly no liquid surface water. There would have been liquid ocean water all the time however.Secondly sun is indeed increasing in luminosity and while 30% sounds like a lot it only represents something like 25 degrees of a black body cooling, currently earth has an average temperature of around 15 degrees so cooling that down by 25 degrees would still leave tropics quite warm. Or put it another way, solar luminosity can be estimated as cos of your latitude if tropics are given a score of 1 with cos 0 then a 30% reduction happens at latitude 45. Milan may not be as hot as Kenya but that's about a 30% reduction in solar output between the locations.
>>16883140Now explain how Mars was able to maintain liquid water.
>>16883102Wait until you learn how they estimate very old temperatures. [spoiler]it's co2 in core samples.
>>16883243Those ice-cores don't even go back 1 million years.
>>16883140The unstable fusion reactor nextdoor melted my greenhouse. );https://en.wikipedia.org/wiki/Order_of_magnitude
>>16883144Uh, no it wasn't. We have pictures of Mars and have landed a few weather stations. It's dry as a bone.
>>16883102black body radiation scales with the fourth power of the temperature, this means you need very high changes in radiation to do small changes in temperature.30% would cause a change of 6% of temperatures, so 18 degrees. It would be colder but not frozen in most of the world.
>>16883116>We know for a fact earth had water before>We know for a fact that mars had water before>Our MODEL of the early sun contradicts this>Ermaherds it is a PARADOXTheir modeling is flawed and they'd prefer not to admit it. Instead they assert their model which contradicts data is a fact, and claim the contradiction is a paradox. What the actual fuck. They need to be hanged.
>>16883368Or perhaps the Earth didn't have water 4 billion years ago. That claim is the result of a model as well.Or, more than likely, there's a third variable which allowed for liquid water on earth with a dimmer sun. That's what most of that article spells out to you.
>>16883102>OMG things change over time and we are still learning.HA checkmate scientist everything I don't like is false.jesus you people are idiots.
>>16883367>>16883141Materials prefer certain temperatures. Liquid water wants to be at its maximum density temperature of 277K and will force less dense hotter or colder water to the surface where it will radiate or absorb heat preferentially to achieve 277K.The oceans are a thermo-gravitational spring that regulate the planetary surface temperature.
>>16883102the sun is the youngest celestial object in the solar system
>>16883656Wrong, the sun and planets are the same age. The cores formed simultaneously but the sun grew fastest and achieved fusion first.
>>16883102Pretty sure before the Great Oxygenation Event, the Earth had a substantial methane component in the atmosphere. The snowball earth happened when that methane went away due to reactions with the new oxygen.
>>16883439Life existed back then so liquid water did too.
https://en.wikipedia.org/wiki/Carbonate%E2%80%93silicate_cycle
The earth is probably somewhat self regulating, the earth used to have a CO2/methane atmosphere that would have had a stronger greenhouse effect and I suppose if it gets too cold to support plant life then less CO2 gets absorbed so the planet heats up, i am talking out my ass tho
