What is the physical size of a black hole?
Stellar-mass black holes are typically in the range of 10 to 100 solar masses, while the supermassive black holes at the centers of galaxies can be millions or billions of solar masses. The supermassive black hole at the center of the Milky Way, Sagittarius A*, is 4.3 million solar masses.
How do you find the radius of a black hole?
The radius of a black hole is related to its mass by the simple formula R = 3 M ,where M is the mass of the black hole in units of the sun’s mass, and R is the radius of the Event Horizon in kilometers.
How big is the mass at the center of a black hole?
And the supermassive black hole at the center of Messier 87 is so huge that astronomers could see it from 55 million light-years away. It’s 24 billion miles across and contains the same mass as 6 1/2 billion suns.
What would be the radius of its event horizon?
The Schwarzschild radius (event horizon) just marks the radius of a sphere past which we can get no particles, no light, no information. RS = km = meters = x 10^ m.
What is the radius of a supermassive black hole?
about 13 million kilometres
The supermassive black hole at the centre of our galaxy, called Sagittarius A*, has a mass of about 4 million solar masses. That makes its Schwarzschild radius about 13 million kilometres. By comparison, the radius of the Earth’s orbit is about 150 million kilometres.
What is the radius of a black hole called?
Black hole classification by Schwarzschild radius. Any object whose radius is smaller than its Schwarzschild radius is called a black hole. The surface at the Schwarzschild radius acts as an event horizon in a non-rotating body (a rotating black hole operates slightly differently).
What is the size of a supermassive black hole?
Supermassive black hole. When a body of this density has grown to around 136 million solar masses (1.36 × 10 8 ) M☉, its physical radius would be overtaken by its Schwarzschild radius, and thus it would form a supermassive black hole.
How big is the event horizon of a black hole?
The size of an event horizon depends on the black hole’s mass. If Earth were compressed until it became a black hole, it would have a diameter of about 0.69 inches (17.4 millimeters), a little smaller than a dime; if the sun were converted to a black hole, it would be about 3.62 miles (5.84 kilometers) wide, about the size of a village or town.
What is the nuclear density of a stellar black hole?
If one accumulates matter at nuclear density (the density of the nucleus of an atom, about 10 18 kg/m 3; neutron stars also reach this density), such an accumulation would fall within its own Schwarzschild radius at about 3 M ☉ and thus would be a stellar black hole.