Ouroboros; that's what fascinates me about cosmology. When the very largest of the large intertwines intimately with the smallest of the small.
Prime example by Nobel prize winning [[Roger Penrose]]: [[conformal cyclic cosmology]]. You need some medium potent psychedelics to fully grok the idea, or some serious maths (which I don't have, which is why [[I will never understand reality]].)
Anyway, here things make brain go boom:
15 million years after the big bang the temperature was 24C. Planets, if they had formed then, could have harboured life in the "endless" summer of the universe. Even [[rogue planet|rogue planets]] could have had flowing water in that cosmic climate. Like a universe-sized womb, stretching for millions of years.
Planets could orbit [[red dwarf|red dwarves]], and albeit tidally locked and hazardous solar flares, life could have had trillions of years to evolve.
There might be 50 billion planets like earth in the [[Milky Way]] galaxy alone (based on 1/4th of stars having rocky planets in the [[habitable zone]], ref. this [[a.LIFE BEYOND Chapter 1. Alien life, deep time, and our place in cosmic history|Life Beyond youtube video]])
That gives us approximately 50 billion stars in the [[Milky Way]] galaxy with potentially habitable planets. Add as many zeroes behind that as you feel like, preferably somewhere in the vicinity of eighteen – then you have an abundance of worlds for life to inhabit.
Yes, many will lack a breathable atmosphere, be too cold, too warm etc., so take away a couple zeroes. Hell, take away ten zeroes, we still have 5 000 000 000 000 000 000 possibilities for somebody inventing capitalism, [[lies-to-children]] and warm, snuggly blankets.
|Kepler-62F||1 200 LY||1.4x Earth||7b yrs||-85F||Possible Water World|
|Trappist-1D||41 LY||0.77x Earth||7.5b yrs||20F||Possible water world|
|Teegarden-B||12 LY||1.07x Earth||8b yrs||20F||Possible water world|
|K2-18B||111 LY||2.7x Earth||-100-116F||Confirmed atmospheric water vapor|
Icy, but with subsurface ocean with hydrothermal vents.
Methane lakes and organic compounds. NASA plans a drone to Titan in 2026.