What is at the Centre of a galaxy?
The centre of the galaxy is a dense and chaotic place, with stars and gas hurtling around the Milky Way’s supermassive black hole, Sagittarius A*. It has a mass more than 4 million times the mass of the sun crammed into a diameter just about 30 times the sun’s width.
Is there a black hole at the center of every galaxy?
Astronomers believe that supermassive black holes lie at the center of virtually all large galaxies, even our own Milky Way. Astronomers can detect them by watching for their effects on nearby stars and gas. This chart shows the relative masses of super-dense cosmic objects.
Why is it bright in the center of a galaxy?
The Galactic centre is bright simply because the are lots of stars packed in there. The number density of stars in the bulge is high. I’m afraid our Supermassive Black Hole, Sgr A* is utterly unimportant in terms of brightness.
Why is it called Milky Way?
The Milky Way gets its name from a Greek myth about the goddess Hera who sprayed milk across the sky. This is what the Milky Way might look like from the side. It’s like a giant disk with a bump in the middle! Without a telescope , we can see about 6,000 stars from Earth.
Can the black hole swallow the Earth?
Will Earth be swallowed by a black hole? Absolutely not. While a black hole does have an immense gravitational field, they are only “dangerous” if you get very close to them. It would get very dark of course and very cold, but the black hole’s gravity at our distance from it would not be a concern.
Where is the galactic bulge?
In the center of the galaxy is the bar-shaped galactic bulge which harbors a supermassive black hole with a mass equal to that of about 3 million suns. Surrounding the central bulge is a relatively thin disk of stars about two thousand light years thick and roughly 100,000 light years across.
Will Sagittarius A destroy Earth?
It won’t happen. It is a small and quiet black hole, compared to the giants in some other galaxies. But none will destroy their galaxy.
What’s in a black hole?
A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A stellar-mass black hole forms when a star with more than 20 solar masses exhausts the nuclear fuel in its core and collapses under its own weight.