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.

How Do Black Holes Form?

Black holes do not go around in space eating stars, moons and planets. Earth will not fall into a black hole because no black hole is close enough to the solar system for Earth to do that.Even if a black hole the same mass as the sun were to take the place of the sun, Earth still would not fall in. The black hole would have the same gravity as the sun. Earth and the other planets would orbit the black hole as they orbit the sun now.The sun will never turn into a black hole. The sun is not a big enough star to make a black hole.

Could a Black Hole Destroy Earth?

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.

What's The Block Hole

NASA is using satellites and telescopes that are traveling in space to learn more about black holes. These spacecraft help scientists answer questions about the universe.

How Is NASA Studying 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 in an object.
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.

How Big Are Black Holes?

A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting, a black hole.When a black hole and a star are close together, high-energy light is made. This kind of light can not be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.

How Do We Know The Black Hole Is Black? 

Seattle teenagers of the 1970s are suddenly faced with a devastating, disfiguring, and incurable plague that spreads only through sexual contact.

technologyandthefuture

Technology & The Future

books

Books

scienceandnature

Science & Nature

“The best graphic novel of the year” (Time) tells the story of a strange plague devastating the lives of teenagers in mid-1970s suburban Seattle, revealing the horrifying nature of high school alienation—the savagery, the cruelty, the relentless anxiety, and the ennui. We learn from the outset that a strange plague has descended upon the area’s teenagers, transmitted by sexual contact. The disease is manifested in any number of ways—from the hideously grotesque to the subtle (and concealable)—but once you’ve got it, that’s it. There’s no turning back. As we inhabit the heads of several key characters—some kids who have it, some who don’t, some who are about to get it—what unfolds isn’t the expected battle to fight the plague, or bring heightened awareness to it , or even to treat it. What we become witness to instead is a fascinating and eerie portrait of the nature of high school alienation itself. And then the murders start. As hypnotically beautiful as it is horrifying, Black Hole transcends its genre by deftly exploring a specific American cultural moment in flux and the kids who are caught in it—back when it wasn’t exactly cool to be a hippie anymore, but Bowie was still just a little too weird. To say nothing of sprouting horns and molting your skin…

How Do Black Holes Form?

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How Big Are Black Holes?

Black Holes