You can’t go back into the past, but if you got close enough to a black hole, you could travel to the future. Want to be a time traveller? Hang around an area with extreme gravity for a while. True: you could use black holes to travel forward in time But for us to accept that latter option, those tweaked theories will need to be developed, tested, and proven-and still be able to explain simpler physics like why you don’t float away from Earth when you jump, or how we can use gravitational boosts of planets to get spacecraft to specific targets in the outer solar system. Pyle.įrom all that we’ve learnt, it’s either the case that black holes really do exist, or the laws of physics as we know them need to be tweaked. A collision of two black holes has been detected through the measurement of gravitational waves. The ripple matched the predicted signal of two colliding black holes, giving us direct evidence for their existence. By directing two lasers beams down a long tunnel and looking for abnormalities in how the light travels, scientists detected a ripple in space itself. Not satisfied with indirect evidence? Enter the gravitational wave discovery, first announced in February 2016 and with a second detection announced in June 2016. There’s nothing else we think that it could be other than a black hole. You find that there is something there that’s over four million times the mass of our sun but in a tiny area that produces absolutely no light. This includes observations of how objects move around black holes, or how light is distorted. But we can see them indirectly, based on how they influence the matter around them. We cannot directly see black holes with any light we know how to detect. So to prove black holes exist, we need to look at astronomical observations. Although these laws of physics have held up against experimental testing, that’s still not a guarantee that these extreme scenarios really happen in nature. The idea of black holes has been around for hundreds of years, ever since scientists took the known laws of physics and determined what would happen at their most extreme. Let’s start with some truths-things we are almost certain to be correct based on our current knowledge.
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