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Black Hole: How Big Are Black Holes?

Black holes are regions of space where gravity is so strong that not even light can escape. They form when a large star collapses in on itself. Black holes come in different sizes, from small black holes the mass of a large mountain to supermassive black holes over a million times the sun's mass found at the center of galaxies. The event horizon marks a black hole's boundary where light is pulled in and the singularity is the infinitely dense core.

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Muhammad Hassan
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42 views2 pages

Black Hole: How Big Are Black Holes?

Black holes are regions of space where gravity is so strong that not even light can escape. They form when a large star collapses in on itself. Black holes come in different sizes, from small black holes the mass of a large mountain to supermassive black holes over a million times the sun's mass found at the center of galaxies. The event horizon marks a black hole's boundary where light is pulled in and the singularity is the infinitely dense core.

Uploaded by

Muhammad Hassan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Black Hole

A black hole is a place in space where gravity pulls so much that even light can not get out. The
gravity is so strong because matter has been squeezed into a tiny space. This can happen when a
star is dying.

Because no light can get out, people can't see black holes. They are invisible. Space telescopes with
special tools can help find black holes. The special tools can see how stars that are very close to
black holes act differently than other stars.

How Big Are Black Holes?


Black holes can be big or small. Scientists think the smallest black holes are as small as just one
atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of
matter, or "stuff," in an object.

Another kind of black hole is called "stellar." Its mass can be up to 20 times more than the mass of
the sun. There may be many, many stellar mass black holes in Earth's galaxy. Earth's galaxy is
called the Milky Way.

The largest black holes are called "supermassive." These black holes have masses that are more
than 1 million suns together. Scientists have found proof that every large galaxy contains a
supermassive black hole at its center. The supermassive black hole at the center of the Milky Way
galaxy is called Sagittarius A. It has a mass equal to about 4 million suns and would fit inside a very
large ball that could hold a few million Earths.

How Do Black Holes Form?


Scientists think the smallest black holes formed when the universe began.

Stellar black holes are made when the center of a very big star falls in upon itself, or collapses.
When this happens, it causes a supernova. A supernova is an exploding star that blasts part of the
star into space.

Scientists think supermassive black holes were made at the same time as the galaxy they are in.
Black Hole Layers

Event Horizon
A black holes' event horizon is its outermost boundary. This is the point at which the
gravitational force precisely overcomes light's ability to escape the black hole's pull. 

Singularity?
A singularity or gravitational singularity is a point at the very center of a black hole. It is
a one-dimensional point that contains enormous amounts of mass in an infinitely small
space. 

Here gravity and density become infinite, space-time curves infinitely and the laws of
known physics are thought to no longer apply

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