The Expansion of the Universe

We can wait a while to explore the Universe, but we shouldn’t wait too long. If the Universe continues its accelerating expansion as predicted by the usual model of cosmology, eventually all galaxies outside our Local Group will become completely inaccessible, in principle by any form of transportation not faster than light!

The table here is from this paper:

• Toby Ord, The edges of our Universe.

150 billion years sounds like a long time, but the smallest stars powered by fusion—the red dwarf...