Origin of black hole
Words nearby black hole
Other definitions for black hole (2 of 2)
How to use black hole in a sentence
The world that Black Dynamite lives in is not the most PC place to be in.
Music is a huge part of the tone of Black Dynamite overall—going back to the original 2009 movie on which the series is based.
How far has Congress really evolved on race when in 50 years it has gone from one black senator to two?
Even the arguably more democratic House is only at 10 percent black members.
But in the case of black women, another study found no lack of interest.
Suddenly, however, he became aware of a small black spot far ahead in the very middle of the unencumbered track.The Joyous Adventures of Aristide Pujol|William J. Locke
Before he could finish the sentence the Hole-keeper said snappishly, "Well, drop out again—quick!"Davy and The Goblin|Charles E. Carryl
Kind of a reception-room in there—guess I know a reception-room from a hole in the wall.
The lady in black was reading her morning devotions on the porch of a neighboring bathhouse.The Awakening and Selected Short Stories|Kate Chopin
Squinty, several times, looked at the hole under the pen, by which he had once gotten out.Squinty the Comical Pig|Richard Barnum
British Dictionary definitions for black hole
Scientific definitions for black hole
A Closer Look
When a very massive star ends its life in a supernova explosion, the remaining matter collapses in upon itself. If there is enough mass in this collapsed star, it becomes a black hole. A black hole is so dense that its gravitational forces are strong enough to prevent anything that comes close enough to the region known as the event horizon from escaping. Even light cannot escape, since the escape velocity (the velocity needed for an object to escape some larger object's gravitational field) necessary to escape a black hole is greater than the speed of light. Black holes are extremely dense: for the Sun, which has a diameter of about 1,390,000 kilometers (862,000 miles), to be as dense as a black hole, its entire mass would have to be squeezed down to a ball fewer than 3 kilometers (5 miles) across. Some theorists postulate that the material in a black hole may be compressed to a single point of infinite density called a singularity. Because astronomers cannot directly observe a black hole, they infer its existence from the effects of its gravitational pull. For example, when a black hole results from the collapse of one star in a binary star system, it attracts material from the remaining star. This material forms an accretion disk, which compresses and heats up until it emits detectable x-rays. Black holes are thought to reside in the centers of many galaxies, including our own Milky Way.
Cultural definitions for black hole
In astronomy, an object so massive that nothing, not even light, can escape its gravitation. Black holes were given their name because they absorb all the light that falls on them. The existence of black holes was first predicted by the general theory of relativity. Supermassive black holes have been found in the centers of many galaxies. Stellar black holes are thought to arise from the death of very massive stars. Astronomers expect to find many stellar black holes in the Milky Way.
notes for black hole
Other Idioms and Phrases with black hole
A wretched prison cell or other place of confinement. For example, The punishment is solitary confinement, known as the black hole. This term acquired its meaning in 1756 with the event known as the Black Hole of Calcutta. On the night of June 20, the ruler of Bengal confined 146 Europeans in a prison space of only 14 by 18 feet. By morning all but 23 of them had suffocated to death. Although historians since have questioned the truth of the story, it survives in this usage.
A great void or abyss. For example, Running a single small newspaper ad to launch a major campaign is useless; it amounts to throwing our money into a black hole. This usage alludes to a region, so named by astronomers, whose gravitational field is so intense that no electromagnetic radiation can escape from it. [Late 1970s]