What Mechanism in the Vicinity of a Star Gives Astronomers

question 67

Multiple Choice

What mechanism in the vicinity of a star gives astronomers a hint of the presence of a black hole as a companion to the star?

• A) The light from the companion star shows extreme redshift because of the gravitational field of the black hole.
• B) The star periodically disappears from the viewpoint of Earth during its eclipses by the black hole as the two objects orbit each other.
• C) The space near the star darkens, indicating that the black hole prevents the light from distant objects from reaching Earth.
• D) Gas from the star, falling in toward a black hole, is compressed to very high densities and temperatures so that it emits an intense and rapidly fluctuating flux of X-rays.

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