Which of the following is thought to be a black hole?
A) Gleise 229B
B) Sirius B
C) Orion Nebula
D) Cygnus X-1

Name: Which of the following is thought to be a black hole? A) Gleise 229B B) Sirius B C) Orion Nebula D) Cygnus X-1
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Question

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Cygnus X-1 is widely accepted as a black hole due to its strong X-ray emissions and the observed motion of its companion star, which suggests the presence of a very massive, invisible companion that fits the characteristics of a black hole.

Which of the Following Is Thought to Be a Black