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Black holes are regions of space where the gravitational pull is so strong that nothing — not even light — can escape. Rather than empty space, black holes are chock full of matter that gets squeezed into a teensy space.  Who discovered black holes? Physicist Karl Schwarzschild accidentally discovered black holes in 1916, when he was figuring out a particular solution to Einstein's general theory of relativity. He was trying to find the solution to the gravitational pull of a single, solitary, symmetric ball of matter — such as the sun at the center of our solar system. But that solution contained a peculiar feature: the theory behaved strangely at a specific radius, known today as the Schwarzschild radius. It was later realized why this radius was so special. If you compressed the mass of an object into a space smaller than that radius, its gravitational pull would overwhelm every known force and nothing could escape. Early physicists assumed that this situ...

Experts say that compared to the sun’s equator, our Sun is tilted by about 6 degrees. Since the 1970s, astronomers have not been able to figure out why this is happening. Now, experts think they may have found a solution: Planet Nine. Elizabeth Bailey works at the California Institute of Technology in Pasadena as an astrophysicist and planetary scientist. She says that planet nine tilted our sun by six degrees and that the missing planet may have also tilted the other planets over the course of the solar system ’s History . Planet Nine is a celestial body that hasn’t been found yet but is thought to be at the very edge of our solar system . Konstantin Batygin and Mike Brown predicted its existence in January 2016. Experts say that all of the planets in our solar system move around the sun in a flat plane that is within a few degrees of each other. But experts say that plane rotates at a six-degree angle to the sun, which makes it look like the sun isn’t in the right pla...