look at the time-lines of the universe and some of the entries, especially the last few, are mind blowing (
https://en.wikipedia.org/wiki/Timeline_of_the_far_future )
e.g.
"Due to the gradual slowing down of Earth's rotation, a day on Earth will be one hour longer than it is today"
"From its present position, the Solar System completes one full orbit of the Galactic Center"
"All the continents on Earth may fuse into a supercontinent (Pangaea Ultima, Novopangaea, or Amasia)"
"Tidal acceleration moves the Moon far enough from Earth that total solar eclipses are no longer possible."
"the Andromeda Galaxy will have collided with the Milky Way, which will thereafter merge to form a galaxy dubbed "Milkomeda" ... There is also a small chance of the Solar System being ejected. The planets of the Solar System will almost certainly not be disturbed by these events"
"time until stellar close encounters detach all planets in star systems (including the Solar System) from their orbits"
"time until those stars not ejected from galaxies (1–10%) fall into their galaxies' central supermassive black holes. By this point, with binary stars having fallen into each other, and planets into their stars"
"estimated time for rigid objects, from free-floating rocks in space to planets, to rearrange their atoms and molecules via quantum tunneling. On this timescale, any discrete body of matter "behaves like a liquid" and becomes a smooth sphere due to diffusion and gravity"
"... they [Positrons] find a distant electron to pair with and the two enter into a highly excited state of positronium, with a radius larger than the current universe. Over the next 10^141 years they will gradually spiral inwards until they finally annihilate"
"time until a supermassive black hole with a mass of 20 trillion solar masses decays by Hawking radiation ... marks the end of the Black Hole Era. Beyond this time, if protons do decay, the Universe enters the Dark Era, in which all physical objects have decayed to subatomic particles"
"... time for all nucleons in the observable universe to decay ..."
"... estimated time until all baryonic matter in stellar-mass objects has either fused together [into iron-56] ... or decayed from a higher mass element into iron-56 to form an iron star"
"Estimated time for a Boltzmann brain to appear in the vacuum via a spontaneous entropy decrease"
"estimate for the time until all iron stars collapse into black holes ... which then (on these timescales) instantaneously evaporate into subatomic particles ... Beyond this point, it is almost certain that Universe will contain no more baryonic matter and will be an almost pure vacuum until it reaches its final energy state ..."
"Because the total number of ways in which all the subatomic particles in the observable universe can be combined is a number which, when multiplied by , disappears into the rounding error, this is also the time required for a quantum-tunnelled and quantum fluctuation-generated Big Bang to produce a new universe identical to our own ..."