Well, we&#x27;re getting photons and probably cosmic rays from Sagittarius A<i>, so not that unlikely. :-)<p>You&#x27;re right about small mass but macroscopic objects though, since Sag A</i>&#x27;s rotation is very sub-extremal, its mass is sufficiently high (higher mass means less curvature just outside the horizon), and its accretion structures and jets are sufficiently dim that there is essentially no chance for a rocky object to get any sort of gravity assist, much less to relativistic speeds.<p>Much smaller black holes are likely sources of &quot;dangerous&quot; gravity assists, but they also usually have accretion structures whose ICS-boosted radiation would probably disintegrate candidate objects.<p>On the other hand, even a fairly small chunk of rock boosted to near the speed of light would pretty much end Earth.   (Time to dig up <a href="https:&#x2F;&#x2F;what-if.xkcd.com&#x2F;1&#x2F;" rel="nofollow">https:&#x2F;&#x2F;what-if.xkcd.com&#x2F;1&#x2F;</a> :) )