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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]].)

The fun part of cosmology is having your mind blown

Anyway, here things make brain go boom:

Questions Cosmology Cultivated in Me and Topics that Tickle me Physical Fancies

Size, Eternity, Infinity, Multiplicity, the End

Ways in Which the End May Come

Cosmology Quotes


  • Alan Guth Revered, subtle sense of humour
  • Andrei Linde Russian, but smiles and has a sense of humour.
  • Kip Thorne
  • Brian Greene String theory, does a lot of panels.
  • [[Roger Penrose]] So matter-of-fact you can possibly be without becoming arrogant and condescending. Not the most jokes, but I have a fondness for him. Closing in on 90 years old and sharp as a tack.
  • Neil Turok
  • Stephen Hawking


Videos to Watch

World Science Festival

Life in the Universe

Life in the very early universe

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.

Life in the very late universe

Red Dwarf Stars

Planets could orbit [[red dwarf|red dwarves]], and albeit tidally locked and hazardous solar flares, life could have had trillions of years to evolve.

Planets possibly capable of sustaining life

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-62F1 200 LY1.4x Earth7b yrs-85FPossible Water World
Trappist-1D41 LY0.77x Earth7.5b yrs20FPossible water world
Teegarden-B12 LY1.07x Earth8b yrs20FPossible water world
K2-18B111 LY2.7x Earth-100-116FConfirmed atmospheric water vapor

Moons in our solar system


Icy, but with subsurface ocean with hydrothermal vents.


Methane lakes and organic compounds. NASA plans a drone to Titan in 2026.

Speculative, spectacular, imagination fodder

See Also