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That's because clouds of hydrogen gas absorb far-ultraviolet light, and the most distant galaxies have the largest amount of hydrogen gas between them and Earth (SN: 2/24/96, p. Nonetheless, the image taken in far-ultraviolet wavelengths captured more than 400 stars and star-forming galaxies in the constellation Hercules, while the near-ultraviolet picture recorded more than 1,500 such objects. His team examined 60 clouds at far-ultraviolet wavelengths, which for the first time, revealed the clouds' hot, outer edges. |
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