About how massive is the Milky Way’s central black hole, measured in Suns?
Answer
4.3 million solar masses
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About how massive is the Milky Way’s central black hole, measured in Suns?
Answer
4.3 million solar masses
Which X-ray source became the first widely accepted stellar-mass black-hole candidate?
Answer
Cygnus X-1
Which English scientist proposed “dark stars” that could trap light in 1783?
Answer
John Michell
What is the approximate Schwarzschild radius of a black hole with the Sun’s mass?
Answer
3 kilometres
What boundary marks the point beyond which nothing can escape a black hole?
Answer
Event horizon
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Which English scientist proposed “dark stars” that could trap light in 1783?
Answer
John Michell
What boundary marks the point beyond which nothing can escape a black hole?
Answer
Event horizon
What process predicts that black holes can emit thermal radiation?
Answer
Hawking radiation
What is the name of the black hole at the centre of the Milky Way?
Answer
Sagittarius A*