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In the image taken by NASA's Chandra X-ray Observatory, on the left you can see a visible-light photograph of the Whirlpool galaxy merging with a smaller, companion galaxy. The x-ray photograph of the smaller galaxy can be seen in the inset, which shows a black hole at the center and two blasts of x-ray radiation it gave out 3, and 6 million years ago (inner and outer x-ray arc respectively). How could the astrophysicists figure out the age of these radiations? |
Answer» In the image taken by NASA's Chandra X-ray Observatory, on the left you can see a visible-light photograph of the Whirlpool galaxy merging with a smaller, companion galaxy. The x-ray photograph of the smaller galaxy can be seen in the inset, which shows a black hole at the center and two blasts of x-ray radiation it gave out 3, and 6 million years ago (inner and outer x-ray arc respectively). How could the astrophysicists figure out the age of these radiations? |
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