![]() ![]() The neutron star RX J0822-4300 was measured to move at a record speed of over 1,500 km/s (0.5% of the speed of light)īlack holes can have similar speeds, but we have less data about them since they are so hard to detect, unless they are accreting matter, or have a visible companion. For example, the hypervelocity star B1508+55 has been reported to have a speed of 1100 km/s However, some pulsars have a much greater velocity. It is generally accepted today that the average pulsar kick ranges from 200–500 km/s. If the star is not quite massive enough, it may collapse to a neutron star or BH without an accompanying explosion.Ī supernova explosion is very energetic, and generally not very symmetrical, so the remnant neutron star or BH may receive a substantial kick, causing it to travel at a speed that's considerably higher than the other stars in its stellar neighbourhood. The explosion throws off a lot of matter at very high speed, and the remaining matter forms a neutron star or a black hole. ![]() ![]() Stellar mass BHs are usually formed in core-collapse supernova explosions, when the core of a very massive star collapses at the end of its life. However, there is currently no observational evidence that they definitely exist, although very small primordial BHs might contribute to dark matter, and primordial BHs of all sizes might have been involved in the formation of the supermassive BHs found at the cores of most galaxies. But the odds of that happening are spectacularly slim so I wouldn't worry too much about it.Īs Woody mentions, there might be primordial BHs (black holes), with a wide range of masses, scattered through the cosmos. If a black hole (of sufficient size) did collide towards us on Earth, we'd be in a fair bit of trouble and probably wouldn't survive. The gravitational force on the Earth wouldn't change all that much.Īs The Rocket Fan correctly points out, there would be no sunlight and a bit more radiation coming at us, but with all else being equal, the fact that it's a black hole rather than a star doesn't change the rules or make it so we will be sucked in. If the sun were replaced by an improbably large rock with the same mass then it would be the same story (ignoring volume concerns with density), and the same is true with a black hole. If the sun were replaced by a different star of the same mass, then the Earth would keep going round in its orbit - same mass means same gravity. Black holes aren't cosmic vacuum cleaners - they obey the same rules of gravity as any other object. It might be best in this case to think of a black hole like any other massive object. Theorized to be the result of a 9th planet in the solar system.Īre tennis ball sized black holes, many times the mass of Earth, zipping around interstellar space? If one happened to pass through the Earth, we wouldn’t see it coming. (Earth masses), about the diameter of a tennis ball, existing in theĮxtended Kuiper Belt to explain the orbital anomalies that are The possibility of a primordial black hole (PBH) with mass 5–15 MEarth In September 2019, a report by James Unwin and Jakub Scholtz proposed Primordial Black Holes have been invoked to explain all sorts of mysteries in cosmology, like Dark Matter. The little ones (smaller than a moderate sized asteroid) would have evaporated by now due to Hawking Radiation. Unlike the familiar Stellar Black Holes, they could have formed from almost any size mass: from a fraction of a gram to thousands of solar masses. These Bad Boys formed in the first second after the Big Bang. ![]()
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