How much power did the collision emit relative to the visible universe?

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Study for the NOVA Black Hole Apocalypse Astronomy Test. Explore astronomy with our rich content. Use flashcards and multiple-choice questions to enhance your knowledge. Prepare effectively and uncover the mysteries of black holes. Get ready for your exam!

Multiple Choice

How much power did the collision emit relative to the visible universe?

Explanation:
Power is energy per unit time, so the question is about how large the instantaneous energy output was during the peak of the collision. In the landmark black-hole merger, a huge amount of energy was dumped into gravitational waves in a tiny fraction of a second. The peak luminosity (the power at the brightest moment) is estimated to be around 10^49 watts. Estimates for the total light power of all stars visible in the night sky over time are much lower, on the order of 10^47–10^48 watts. Comparing those, the collision’s peak power comes out roughly fifty times greater than the combined power of all visible stars. So the best match among the choices is about 50x the entire visible universe. This emphasizes how briefly huge power outputs can occur in gravitational-wave events even if the total energy isn’t enormous on human timescales.

Power is energy per unit time, so the question is about how large the instantaneous energy output was during the peak of the collision. In the landmark black-hole merger, a huge amount of energy was dumped into gravitational waves in a tiny fraction of a second. The peak luminosity (the power at the brightest moment) is estimated to be around 10^49 watts. Estimates for the total light power of all stars visible in the night sky over time are much lower, on the order of 10^47–10^48 watts. Comparing those, the collision’s peak power comes out roughly fifty times greater than the combined power of all visible stars. So the best match among the choices is about 50x the entire visible universe. This emphasizes how briefly huge power outputs can occur in gravitational-wave events even if the total energy isn’t enormous on human timescales.

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