~Anvi Patil(Xth A Abhinav Vidyalay)
What is Dark Matter?
It is a non-luminous material, which holds two galaxies. This cannot be called a black hole because it does not bend light.
Then the question arrives, as it is non-luminous, how did we detect it?
As it is not visible, scientists have found indirect methods to find more about it. One such method is by using the Fermi Gamma-Ray Space Telescope. Gamma rays are released when two particles of dark matter collide, Fermi telescope can be used to detect this collision.
This topic was discovered by Fritz Zwicky in the 1930s, he discovered that galaxies were rotating at a faster rate than usual.
|A dark region seen in the foreground of a star field. This dark region could be a dark cloud of gases like hydrogen, left over from the formation of our galaxy
She found that the speed is even faster on the outskirts of the galaxies. there is very less count of stars on the outside of galaxies. if there was more matter, then only there was a way to make the equations work. This was named dark matter.
There are many theories about Dark Matter. Some say it doesn't exist. Others say it consists of black holes, brown dwarfs, and neutron stars. It could be small subatomic particles that don't react with normal matter. Some say that it has more speed than light, which makes them extremely hot.