Black hole - Wikipedia
A black hole is a region of spacetime where gravity is so strong that nothing, not even light and other electromagnetic waves, is capable of possessing enough energy to escape it. [2] Einstein's theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. [3] [4] The boundary of no escape is called the event horizon.
Black hole | Definition, Formation, Types, Pictures, & Facts
2024年10月10日 · Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. It can be formed by the death of a massive star wherein its core gravitationally collapses inward upon itself, compressing to a point of zero volume and infinite density called the singularity.
What Are Black Holes? - NASA
2020年9月8日 · A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole’s “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of …
How do black holes form? - Astronomy Magazine
2020年2月24日 · The most well-understood black holes are created when a massive star reaches the end of its life and implodes, collapsing in on itself. A black hole takes up zero space, but does have mass...
Black Holes | Center for Astrophysics | Harvard & Smithsonian
Black holes are found in the centers of most galaxies, where they can influence star formation and the distribution of atoms in the environment surrounding them. However, direct observation of a black hole is difficult because it is so small relative to their masses.
Black Holes - NASA Science
Black holes can be surrounded by rings of gas and dust, called accretion disks, that emit light across many wavelengths, including X-rays. A supermassive black hole’s intense gravity can cause stars to orbit around it in a particular way.
Black holes: Everything you need to know | Space
2022年5月6日 · How do black holes form? Black holes are expected to form via two distinct channels. According to the first pathway, they are stellar corpses, so they form when massive stars die.
Black Holes 101 | National Geographic - YouTube
Learn about the types of black holes, how they form, and how scientists discovered these invis...
Black Hole Anatomy - Science@NASA
The main light source from a black hole is a structure called an accretion disk. Black holes grow by consuming matter, a process scientists call accretion, and by merging with other black holes. A stellar-mass black hole paired with a star may pull gas from it, and a supermassive black hole does the same from stars that stray too close.
What Is a Black Hole? | NASA Space Place – NASA Science for Kids
2024年10月11日 · A black hole is an area of such immense gravity that nothing—not even light—can escape from it. Black holes form at the end of some stars’ lives. The energy that held the star together disappears and it collapses in on itself producing a magnificent explosion.