New discovery today in Astrophysics : holes in our Milky Way. Much like bullet holes. Something has torn away all the matters in its path. But of course in a galactic scale it can't be a lump of matter.
The suspect right now is dark matter.
Two such holes found. But couldn't find any info on dia or size.
https://www.zmescience.com/science/cosmic-bullet-holes-galaxy-05343/