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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 ...


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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