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# BlackHole in polorized light-NASA

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What Is a Black Hole?
cygx1_ill.jpg
An artist's drawing a black hole named Cygnus X-1. It formed when a large star caved in. This black hole pulls matter from blue star beside it.
Credits: NASA/CXC/M.Weiss
blackhole_2.jpg
An artist's drawing shows the current view of the Milky Way galaxy. Scientific evidence shows that in the middle of the Milky Way is a supermassive black hole.
Credits: NASA/JPL-Caltech
Black hole Sagittarius A
This image of the center of the Milky Way galaxy was taken by the Chandra X-ray Observatory.
Credits: NASA/CXC/MIT/F.K. Baganoff et al.
sgr_lg.jpg
Sagittarius A* is the black hole at the center of the Milky Way galaxy.
Credits: X-ray: NASA/UMass/D.Wang et al., IR: NASA/STScI

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.

1. ScaWo2:35
2. thoreau2:43
3. leriger22:58
4. Grockle3:12
5. dogs_n_me3:20
6. ddot14:04
7. thrashempress4:31
8. Mngal34:42
10. katarzyna5:31

Thank you so much for your encouraging comment, Elvis-

@myself1935
This is great! My slow time is not indicative of my profound interest. Please keep publishing these very interesting scientific puzzles! (Or really, anything that captures YOUR interest. That would certainly be interesting to your followers, too!)

We live in a world of wonder, Peggy- For as much as is known, there is so much yet to be discovered- They keep on creating more and more machinery to allow us to explore the previously thought to be mysteries -

Wow!!! Hard to fathom.

Thank you Donna-
l am glad to see you relaxing here with us- l hope things are better-

Interesting information to go along with a fantastic photo. Thanks, Jean. :-)) dj

You as well, Helen- l am so glad you are back-

Thank you so much for adding me to your list~~~~ I enjoy puzzling with you and others on your list! Please take care, my friend!!!!

l'm so glad, Helen- This was not posted for the masses- just for the precious few who will appreciate it- like you!

A simple study in color, thanks to you, Jean, and also NASA!!! I enjoyed puzzling this one a lot, my friend!