The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
A black hole is a region of spacetime where gravity is so strong that nothing-no particles or even electromagnetic radiation such as light-can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
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Supermassive black holes A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with mass on the order of millions to billions of times the mass of the Sun. Black holes are a class of astronomical objects that have undergone gravitational collapse, leaving behind spheroidal regions of space from which nothing can escape, not even light. Observational evidence indicates that almost every large galaxy has a supermassive black hole at the galaxy's center. The Milky Way has a supermassive black hole in its Galactic Center, which corresponds to the location of Sagittarius. Accretion of interstellar gas onto supermassive black holes is the process responsible for powering active galactic nuclei and quasars.
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Colliding black holes Seven billion years ago, two truly huge black holes slammed together and formed one 142 times the mass of the sun. An image shows the gravitational waves produced during the largest black hole collision ever detected. Seven billion years ago, two large black holes crashed together and formed a massive new one.
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