The first confirmed black hole, Cygnus X-1, was regarded as proof that black holes exist because it
A) is a compact object in a binary system
B) emits X-rays from a hot accretion disk
C) is accreting matter from a main-sequence companion
D) has a period of 5.6 days
E) has a mass of ten solar masses
Correct Answer:
Verified
Q29: If the Sun was replaced by a
Q30: Matter falling onto a compact object, such
Q31: An X-ray burster occurs in a pulsar
Q32: The event horizon of a black hole
Q33: The jets emitted by compact objects are
Q35: Millisecond pulsars _.
A) are created in supernova
Q36: Pulsar planets are _.
A) huge gas planets
Q37: Astronauts approaching a black hole would observe
Q38: A black hole is _.
A) an object
Q39: Gas falling into a black hole:
A) is
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