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  1. 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.

  2. Scientists use our fleet of telescopes to help us understand objects from our nearest neighbor stars, to monster black holes and distant galaxies. Anatomy of a black hole interactive

  3. They’re huge concentrations of matter packed into very tiny spaces. A black hole is so dense that gravity just beneath its surface, the event horizon, is strong enough that nothing – not even light – can escape. The event horizon isn’t a surface like Earth’s or even the Sun’s.

  4. www.nasa.gov › universe › what-are-black-holesWhat Are Black Holes? - NASA

    8 Σεπ 2020 · 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 light, which is the speed limit of the cosmos.

  5. 27 Οκτ 2015 · This diagram shows how a shifting feature, called a corona, can create a flare of X-rays around a black hole. The corona (feature represented in purplish colors) gathers inward (left), becoming brighter, before shooting away from the black hole (middle and right).

  6. Basic Black Hole Anatomy Black holes are physical objects in space, just like stars and planets. They have so much mass packed into such a small sphere that nothing, not even light, can escape their gravity. Features all have in common Event horizon: the black hole’s “surface” — the point of no return Spin: how fast depends on the ...

  7. 23 Οκτ 2024 · The event horizon is what makes a black hole black. It is often described as the ‘surface’ of a black hole, though it is not a surface in the traditional sense. It is the critical boundary around a black hole where the required escape velocity surpasses the speed of light, making escape impossible.

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