Black holes affect time
Just as a clock runs a bit slower closer to sea level than up on a space station, clocks run really slow near black holes. It all has to do with gravity.
They can be infinitely big
There are a few theories that state they can be infinitely big. While not all scientists agree, there are several who believe that they can be infinitely big.
The nearest black hole to the Earth is 1,600 light years away
Our galaxy is covered in black holes, but the one most likely to destroy our measly planet is still well beyond our solar system’s borders.
Stay away from the event horizon
The “Event Horizon” as it is called in physics, is the border of the black of hole. It’s the point of no return. Before that point, you can still escape. After that point…not a chance.
There is a massive black hole at the center of the Milky Way galaxy.
It’s 30,000 light years away and is over 30 million times as massive as our sun.
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abgeleitetes Werk: Sponk (talk) English: Black_Hole_Milkyway.jpg: Ute Kraus, Physics education group Kraus, Universität Hildesheim, Space Time Travel, (background image of the milky way: Axel Mellinger)
derivative work: Sponk (talk), Black Hole Milkyway Event Horizon, CC BY-SA 2.5 , 23. WikipediaCommons.com (Public Domain), 24. WikipediaCommons.com (Public Domain), 25. PublicDomaintPictures.net (Public Domain)