Astronomers say big cool patches on the Betelgeuse star likely drove its surprise dimming last year.
Tags: astrophysics space astronomy stars
BBC News profiles the space travellers who will launch in SpaceX's Crew Dragon capsule on Wednesday.
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No strangers to isolation, the trio left for the space station months before Covid-19 emerged.
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Astronomers want more public funds to help search for intelligent life elsewhere in the universe.
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