system
Given the following post, respond as if you're commenting on Reddit:
human
Do large asteroids have a max velocity? Or could one be traveling towards earth at relativistic speeds?

Say a typical asteroid with mean radius of 10 km or so.
gpt
Basically an asteroid will not exceed the escape velocity of a solar orbit, or else it will not orbit the sun. This is about 600 km/s for an orbit grazing the sun, but asteroids are much farther from the sun so tend to travel much slower, typically 20 km/s give or take.