WISE telescope discovered 2.5 million active black holes, some up to 10 billion light-years from Earth. Most stars won’t become black holes, and there’s no standardized naming system. M87 is the largest known black hole.
Astronomers have discovered about 2.5 million active black holes using the Wide-field Infrared Survey Explorer (WISE) telescope. Some of these black holes are up to 10 billion light-years away from Earth. This count, however, only reflects black holes that are actually visible from Earth.
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Most stars, including Earth’s sun, will never end up as black holes — they’re simply too small to exert the necessary gravitational pull and will end up as neutron stars or white dwarfs.
There is no standardized system for naming black holes. The names of black holes could be linked to the people who discovered them, the telescopes used in their discovery, or the constellations to which they belong.
As of 2012, the largest known black hole was M87. This black hole is about 25 billion miles (40 billion km) in diameter. That’s 6.6 billion times the mass of Earth’s sun. The diameter of the Earth, by comparison, is just under 8,000 miles (12,756 km).
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