Some objects are over 10 billion lightyears away. That's around 1 million times further away than the black hole mentioned in the post. The milky way is 100,000 lightyears across, so really having a black hole within 2000 lighteryears of us is shocking.
Also keyword “known”. Black holes are silent in our detection until it actually starts moving objects or feeding on something. There could be one at the edge of our system and the only thing we’d see out there first is the gravitational pull toward something… big.
This makes me wonder what we should do if a black hole approaches. I don't even understand black holes beyond a basic popular culture level. Would we all have to commit mass suicide to avoid being sucked in as time dilates for millions of years?
You probably should cause spaghettification hurts. Basically the weight on one end of you becomes way more than the one pointing away from the black hole, and it pulls you into a string of subatomic particles before you fall in.
Time dilation is relative to the observer, so time will always appear to go normal for you, but the objects closer to the black hole will appear to slow, while the universe behind you will seem to speed up.
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But in astronomical terms it is just.
Unfortunately, the word trillions used to be just astronomical. Now it's a routine Federal budgetary term.