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Nothing will happen. Neither star is massive enough to become a supernova and their velocities relative to the Earth mean that we will almost certainly be hundereds of light years away from them when they become red giants. A 1 km/s velocity difference over 100 million years leads to a distance difference of about 300 light years. Both Procyon and Sirius ...


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Life on Earth will not be adversely affected when nearby stars become red giants. Certainly, things will get very messy inside those systems: red giants throw out a lot of gas and dust. Red giants are a lot more luminous than the Sun because they have such a huge surface area, but they don't emit large amounts of dangerous radiation, like X-rays or ...


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