One star can basically “eject” the other, which is what some scientists believe could have happened to a theoretical sun-paired star tantalizingly named Nemesis. When they grow too close, one of two very different things can happen. Young stars start farther apart but many are part of pairs, and older stars have moved closer together over billions of years. It follows logically that they’d snag each other and start the long, slow process of orbiting closer and closer together-like the quarter you drop into a spiral wishing well. Because of their powerful gravities, stars have huge fields of influence on the space around them. But this idea also makes intuitive sense. They may be up to 10,000 or more light years apart, which can make them challenging to pick out. It turns out that scientists believe most stars are part of binary star systems, meaning two stars that are gravitationally stuck together at some distance and end up orbiting each other. This is a special category of black hole that exists when one star in a binary pair dies before the other, leaving a black hole that can’t escape the other’s gravity but does not suck up matter or emit its own powerful energy as expected-hence “dormant.” To understand, we need to get twisted up in the spinning distance between binary stars. In new research, scientists bring forward one of the first known examples of a dormant black hole. Pairs of black holes, and how they could form, are key to understanding gravitational waves.The pair of stars likely swirled together for billions of years before one went dark.Scientists have found their first dormant black hole outside the Milky Way.The mass of the solar system consists for more than 99% of the sun, so even if something would somehow push the planets and asteroids into the solar black hole, it would only have a very small effect on its Schwarzschild radius. The event horizon of the solar black hole wouldn't really expand as there isn't any significant mass for the black hole to absorb. I don't know the timescales of these various problems, so I can't say what would kill us first, but the outcome is certain. We'd all die from exposure to the cold eventually as well. Plants would start to die because of the lack of photosynthesis and animals would start to die because of the decreasing amount of plants to feed on and the gradually decreasing O2 content of the atmosphere. The Earth would start to cool down and the carbon-cycle would be interrupted without photosynthesis breaking down CO2 to produce O2. Of course, without the light from the sun, life on Earth will be in serious trouble. But everything that was far away from the sun, like the planets, nothing changes to their orbits. That means that anything close to 3 km to the center will no longer be able to escape. The sun has a Schwarzschild radius of about 3 km. A black hole with the mass of the sun is no different than the actual sun in terms of gravity from where we're sitting. ![]() In terms of gravity and orbit, nothing would change. That's how long it takes light to travel from the sun to Earth and if the sun were to stop emitting light, the last bit of light emitted will arrive at Earth 8 minutes later. If for some reason, the sun were to be artificially compressed into a black hole, it would initially take 8 minutes for us on Earth to notice the change. So we don't have to worry about that at least. ![]() ![]() First of all, the sun is too light to naturally collapse into a black hole at the end of its life cycle.
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