It’s become known in the astronomy world as the “Black Knight.” When it first appeared, they actually thought it was a speck of dust on the lens. But in time, it grew larger and more erratic.
It’s believed to be responsible for a missing Japanese satellite. It works as a space pirate of sorts, allegedly taking things or damaging things it does not want in what it views to be its territory, which is basically all the space outside the earth’s atmosphere.
What is this Black Knight? Should we be concerned?