00:00What's up everyone, how are you? I hope you're all doing well. Today we have a video.
00:03What is a black hole like? Welcome
00:12Currently, many scientists believe that this was the result of a supernova explosion.
00:17The core of a star collapses upon itself until it becomes a simple point of infinite density
00:24because its gravitational force becomes so great that nothing can escape it, not even light.
00:29It's as if the black hole disappeared from the universe
00:35Now, as we know, the nature of a black hole makes it virtually impossible to see it.
00:41Some basic concepts about black holes include the famous accretion disk
00:46This refers to the matter that has accumulated around the hole
00:54An interesting fact is that normal stars also get trapped in an orbit around the black hole.
01:02Gradually, the matter contained in the accretion disk is drawn into the black hole.
01:07As matter disappears from the black hole, astronomers look for X-ray signals.
01:13and stars that appear to rotate in orbits around an empty point in space
01:19That is, stars that revolve around a point where there is too much gravity and only rotate at their own speed.
01:27around
01:30Several black hole candidates have been found
01:33but it is not known exactly how many there are
01:40Okay, let's move on to some more historical topics
01:44of the history of these famous black holes
01:48The appearance of a black hole is similar to that of an X-ray source.
01:52Cygnus X-1, located in the constellation of the swan
01:56which is located in the spiral arms of the Milky Way
02:00exactly 8000 light-years from the solar system
02:03It was discovered in 1964 using an X-ray detector
02:10aboard a suborbital rocket called Aerovi
02:16It orbits around the supergiant star known as HD 2268-68
02:22which has a mass 20 times greater than that of the Sun
02:25This forms a binary system
02:27The source is possibly a black hole.
02:33Astronomers believe that the powerful gravitational force of a black hole
02:38gas is ripped from a giant star
02:41and this same gas forms a creation disk around the empty point in space
02:49At the inner edge of the disk, the gas reaches temperatures of millions of Kelvin.
02:53until it is finally drawn into the black hole
03:00As the gas disappears, it emits intense X-rays.
03:03and these can be observed through X-ray detectors
03:07The black hole remains undetected.
03:11since this is an empty point in space
03:13which emits nothing but X-rays
03:16And that's the matter that's inside it
03:20Black holes can only be detected indirectly.
03:24the X-rays emitted by the matter falling into it
03:29As I mentioned before
03:31The most common signs of a black hole
03:34They can only be detected through X-rays
03:38as I mentioned
03:43Black holes can also reveal their presence
03:46because of the effect they have on light waves
03:49that pass near him
03:50Albert Einstein proved that X-rays
03:53can be deflected by a force of gravity
03:56The light rays emitted by a source located
03:59directly behind a black hole
04:02The light rays emitted by a source located
04:07directly behind a black hole
04:09as seen from Earth
04:12They would be deflected around the black hole.
04:14in what is known as gravitational lensing
04:18The light distorted in this way
04:20It appears to come from two separate but identical sources
04:25Gravitational waves do exist
04:28and would indicate the presence of a black hole
04:33Well, that's all for this video.
04:35I hope you liked it
04:36We continue with this series of informative videos
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04:40Comment on which part you liked the most
04:42Share it on your social media
04:43so that more people can find out about this
04:45Thank you very much and until next time
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