While Traveling the Galaxy in a Spacecraft,you and a Colleague $\bigodot$

question 24

Multiple Choice

While traveling the galaxy in a spacecraft,you and a colleague set out to investigate the 10⁶ M _$\bigodot$ black hole at the center of our galaxy.Your colleague hops aboard an escape pod and drops into a circular orbit around the black hole,maintaining a distance of 1 AU,while you remain much farther away in the spacecraft but from which you can easily monitor your colleague.After doing some experiments to measure the strength of gravity,your colleague signals his/her results back to you using a green laser.What would you see?

• A) His/her signals,because he/she is orbiting well outside the event horizon.
• B) His/her signals,but shifted to a much redder wavelength because he/she is very close to the event horizon.
• C) Nothing,because your colleague has crossed the event horizon.
• D) Nothing,because no light can escape the gravitational pull of a black hole no matter how close he/she is to it.

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