Physics
When is a black hole not a black hole? When it’s a boson star
Astronomers are confident they know what the mysterious massive object at the Milky Way’s heart is – but our first direct view this year could bring a shock
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Astronomers are confident they know what the mysterious massive object at the Milky Way’s heart is – but our first direct view this year could bring a shock
Intermediate-mass black holes – weighing a few hundred to a few thousand solar masses – are the Bigfoot of astronomy, but now we may have seen one in our galaxy