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 …
Why Some Physicists Think We Are Living Inside A Black Hole
2024年5月8日 · Black holes, formed when massive stars collapse, are areas of space where gravity is so strong that not even light can escape. Their existence posed a problem when studying them in terms of...
Black Holes | Center for Astrophysics | Harvard & Smithsonian
Supermassive Black Holes are the monsters of the universe, living at the centers of nearly every galaxy. They range in mass from 100,000 to billions of times the mass of the Sun, far too massive to be born from a single star.
Black Holes - Science@NASA
Black holes are among the most mysterious cosmic objects, much studied but not fully understood. These objects aren’t really holes. They’re huge concentrations of matter packed into very tiny spaces.
Black hole - Wikipedia
A black hole is a region of spacetime wherein gravity is so strong that no matter or electromagnetic energy (e.g. light) can escape it. [2] Albert 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 Types - Science@NASA
Astronomers generally divide black holes into three categories according to their mass: stellar-mass, supermassive, and intermediate-mass. The mass ranges that define each group are approximate, and scientists are always reassessing where the boundaries should be set.
Massive black hole in the early universe spotted taking a ‘nap’ …
2024年12月18日 · The black hole is huge – 400 million times the mass of our Sun – making it one of the most massive black holes discovered by Webb at this point in the universe’s development. The black hole is so enormous that it makes up roughly 40% of the total mass of its host galaxy: in comparison, most black holes in the local universe are roughly 0. ...
Birth of Massive Black Holes in the Early Universe Revealed
2019年1月23日 · A key mystery in astronomy has been: why are there so many supermassive black holes in the early universe? A new study, supported by funding from NASA, the National Science Foundation and a grant from the European Commission, suggests that massive black holes thrive when galaxies form very quickly.
'Far out' blazar discovery suggests early universe had more ...
2025年1月10日 · Labeled J0410–0139, the blazar is at the center of a galaxy 12.9 billion light years away and provides a rare glimpse into what the universe was like when it was less than 800 million years old. The discovery challenges scientists' current notions about the early universe, especially black holes.
How Did Black Holes Grow So Quickly? The Jets - Universe Today
2024年12月23日 · For this reason, black holes with powerful jets also undergo the most powerful growth. We can see many fast-growing black holes in the distant Universe as quasars, or active galactic nuclei. We ...