We still have a long way to go to understand how the universe and everything around it works.
Dark matter makes up four-fifths of the matter in the universe, but I can’t measure or detect it properly. So far, scientists have only been able to detect it indirectly, by observing distant galaxies when a faint glow of light is visible around them. However, this also does not guarantee that it is dark matter at all, nor is it certain that it keeps the universe together and slows down its expansion. Nor is it certain whether it exists at all in the end.
Scientists want to try to determine the properties of this substance using pulsars. It is a type of neutron star whose rotation is very fast and it is able to rotate around its axis in 1.3 seconds. These stars are also interesting in that, in addition to their high density, they have a small diameter of about 20 to 25 kilometers and strongly curve space-time in their surroundings. Of course, not as much as a black hole, but it is also a problem to detect them in the night sky, as their pulses must be directed at us, otherwise their detection is more difficult.
The researchers identified a few pulsars when they noticed a slowdown of just a few inches in their rotation, which in itself isn’t much, but it helped scientists estimate the gravitational force that dark matter exerts on the star. They managed to calculate that there may be less dark matter in the galaxy than they had anticipated, and they also managed to calculate that our planet could only contain 740 grams of this matter.
Scientists have recently been able to detect an unusually high number of gamma rays in the center of the galaxy, which could come from colliding dark matter, when it could be attracted by a black hole. As part of collisions, they annihilate and create gamma rays.
Tajtiez recently revealed scientists from NANOGrav (North American Observatory for Gravitational Waves Nanoherz) to detect a possible signal from the background of gravitational waves. They were able to detect waves that push lightly on Earth as the planet passes “around” the pulsar. But it is too early to rejoice. So far, scientists have only assumed that this is the background of these waves, but they do not have a counter-theory that it may be something else.
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