> Mind you, this simulation is conservative. It assumes that the ships have a range limited to 10 light years — about a dozen stars are within this distance of Earth — and travel at 1% the speed of light.

For comparison the fastest we have done is 200 km/sec and that's doing various gravity gymnastics by Parker Solar probe. 1% speed of light is about 3,000 km/sec.

> 200 km/sec

That also came with a lot of gravitational debt very close to the sun. So it is even worse than it sounds.

There was also another thread here: https://news.ycombinator.com/item?id=27526803

This article says the universe is very old, I think this probably is also "bad astronomy".

At 1% of c it’s doubtful that enough volunteers would participate. 0.01c is fine for leisurely planet hopping in the same solar system but darned inconvenient between stars.