![]() Note that in reality, spacetime is 4-dimensional with one time dimension and three spacial dimensions, but this cannot really be pictured in any sensible way.Īnyway, if we wish to actually describe a point (these are called events) on a curved spacetime manifold, we need coordinates (one time coordinate and three space coordinates) or a coordinate system. This is a sketch of a curved spacetime manifold, which has a time dimension and a spacial dimension. ![]() If you wish to understand the underlying ideas behind this, I recommend reading this introduction to general relativity. The effects of gravity are then modeled by the curvature of this spacetime manifold. Essentially, this means that both space and time are “combined” together into a 4-dimensional geometry known as a manifold. In general relativity, we model everything through a concept called spacetime. In case you’d want an ad-free PDF version of this article (an my other general relativity articles), you’ll find it here, available as part of my full General Relativity Bundle. We’ll also look at some concrete examples of how much time actually slows down near a black hole as well as how different properties of black holes affect this (such as electric charge and spin). In this article, we’ll be discussing all about this slowing down of time -thing in great detail (namely the interesting geometry behind it) as well as looking at some consequences of this phenomenon (such as how it affects aging). According to the theory of general relativity, this phenomenon is due to the gravity of the black hole curving spacetime in a way that affects all measurements of time and space near the black hole. Time slows down near a black hole due to the extremely strong gravitational field of the black hole. One of the more interesting predictions of the theory is that even time will slow down near a black hole. This implies, due to the closeness of the black hole's center, that the black hole's pull on a person will differ by a factor of 1,000 billion times between head and toe, depending on which is leading the free fall.Black holes are some of the most intriguing, yet not very well-understood objects in the universe, which are best described by Einstein’s theory of general relativity. The supermassive black hole at the center of our Milky Way galaxy, by contrast, has a mass of roughly 4 million solar masses, and it has an event horizon with a radius of 7.3 million miles or 17 solar radii. ![]() Why does the math work this way? It’s a matter of facts about black holes of different sizes, the researchers say: “For a black hole with a mass of our Sun (one solar mass), the event horizon will have a radius of just under 2 miles. But, of course, they would never emerge-making this a one-way rollercoaster ride of scientific discovery into oblivion. The person would stay cognizant and intact for longer. To top it off, the telescope comes with a tripod, a finder scope, and a backpack to carry it all. Download the SkyPortal app to help you find specific sites, or use Celestron's Starry Night software-both are free. With two eyepieces-10mm to 20mm-it's suitable for a range of stargazing experiences. Great for beginners (and priced accordingly), this option features a wide, 70 millimeter aperture that will make stars and constellations appear bright and clear.
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