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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

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

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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

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