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black hole
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black hole in M87 black hole
NASA animation: sizing up the biggest black holes
Uncover insight into the black hole
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dust disk around black hole in NGC 4261 stellar evolution
What are gravitational waves and how were they first detected?
How are gravitational waves applied in science and in everyday life?
Know about the discovery of gravitational waves and their role in unlocking secrets of the universe
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View of the Andromeda Galaxy (Messier 31, M31).
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The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
1 July 2002: The Solar and Heliospheric Observatory (SOHO) satellite reveals a massive solar eruption more than 30 times the Earth's diameter. The eruption formed when a loop of a magnetic field over the surface of the Sun trapped hot gas.
Brightest Star in the Solar System
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
M101 (NGC 5457, The Pinwheel Galaxy). Hubble Space Telescope image of face-on spiral galaxy Messier 101 (M101). Largest most detailed photo of a spiral galaxy that has ever been released from Hubble. Created from 1994-2003
Everything in Space in a 25-Minute Quiz
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The merger of two black holes and the gravitational waves that ripple outward as the black holes spiral toward each other. The black holes-which represent those detected by LIGO on Dec. 26, 2015-were 14 and 8 times the mass of the sun, until they merged,
How Do Black Holes Really Work?
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Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963
Was Martin Luther King, Jr., a Republican or a Democrat?
United States elections portal page linking to each election interactive
A History of U.S. Presidential Elections in Maps
Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.
12 Greek Gods and Goddesses
Hemp (Cannabis sativa).
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Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)
6 Cultures That Recognize More than Two Genders
black hole in M87
black hole in M87 Black hole at the center of the massive galaxy M87, about 55 million light-years from Earth, as imaged by the Event Horizon Telescope (EHT). The black hole is 6.5 billion times more massive than the Sun. This picture was the first direct visual evidence of a supermassive black hole and its shadow. The ring is brighter on one side because the black hole is rotating, and thus material on the side of the black hole turning toward Earth has its emission boosted by the Doppler effect. The shadow of the black hole is about five and a half times larger than the event horizon, the boundary marking the black hole's limits, where the escape velocity is equal to the speed of light. Created from data collected in 2017, this picture was released in 2019.

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Top Questions

What is a black hole?

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News •

Astronomers find hundreds of 'hidden' black holes — and there may be billions or even trillions more • Jan. 20, 2025, 12:17 AM ET (Live Science)
'It was very fortunate timing': Astronomers watch 1st black hole to 'shut off' blast back to life • Jan. 17, 2025, 4:23 AM ET (Live Science)
Astronomers detect rare X-ray flares from black hole 1ES 1927+654 caused by a nearby white dwarf • Jan. 15, 2025, 12:06 AM ET (Jerusalem Post)
How Many Black Holes Are Hiding? NASA Study Homes in on Answer • Jan. 13, 2025, 11:21 PM ET (NASA Jet Propulsion Laboratory (.gov))
Astronomers build galaxy-sized ‘detector’ to map universe’s vibrations • Dec. 31, 2024, 3:36 AM ET (The Hindu)

black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself, and the star’s outer layers are blown away. The crushing weight of constituent matter falling in from all sides compresses the dying star to a point of zero volume and infinite density called the singularity. Details of the structure of a black ...(100 of 783 words)

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