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Because February remains a rather uneventful month for astronomical events, let's talk about something that may not exist: wormholes. Not the tunnel dug by a slimy pink animal, but the bending of space and time. Einstein thought that space and time was shaped by gravity, and that massive objects could "bend the fabric" of the universe.
For example, we don't usually think about light being affected by gravity. But in the 1919 Eddington experiment, stars were observed during a solar eclipse observed from two different viewpoints on Earth. The light of the stars appeared to bend around the sun.
Relatively, the sun isn't very heavy. It only bends the "fabric" a little bit. Black holes can be hundreds, millions or tens of billions of times the mass of the sun in a much smaller space. The more mass it has, the tighter it it will squeeze. Some people think there is a limit to how small and dense it can get. Perhaps the black hole becomes strong enough, it will not only bend, but poke a hole in space and time like a needle, leading to a different part of reality. But because a black hole instantly crushes any matter near it, there is no way we could ever look and see.