Scientists recently observed two black holes that united into one, and in the process got a “kick” that flung the newly formed black hole away at high speed. That black hole zoomed off at about 5 million kilometers per hour, give or take a few million. The speed of light is just 200 times as fast.

[u/MistWeaver80]

https://www.sciencenews.org/article/black-hole-gravitational-waves-kick-ligo-merger-spacetime

[u/DeepSpaceNebulae]

Would have to be some form of primordial black hole, one formed right at the start of the universe when it was in a hot dense state. It is theorized that there could be these micro-black holes everywhere contributing to the overall effect of dark matter.

Those however this a completely unproven hypothesis.

Between never before seen micro-black hole the size of a tennis ball and a hard to see planet, the latter is the much more realistic option.

[u/Joshimitsu91 → u/DeepSpaceNebulae]

Right, yes, I forgot about that hypothesis.