See our galaxy's Sagittarius A* black hole and listen to the eery echo of one in the Perseus galaxy.
RELATED: Tornadoes happen most frequently in the US. Here's why
» Subscribe to USA TODAY:
» Watch more on this and other topics from USA TODAY:
» USA TODAY delivers current local and national news, sports, entertainment, finance, technology, and more through award-winning journalism, photos, videos and VR.
#Blackhole #Space #Science