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2021年05月18日Mysterious ‘Superbubble‘ Hollows Out Nebula in New Hubble Telescope ImageMay 18, 2021, United States: The N44 nebula is a complex stellar structure filled with glowing hydrogen gas, dark lanes of dust, massive stars, and many populations of stars of different ages. One of its most distinctive features, however, is the dark, starry gap called a ââ¬Åsuperbubble,ââ¬Â visible in this Hubble Space Telescope image in the upper central region...The hole is about 250 light-years wide and its presence is still something of a mystery. Stellar winds expelled by massive stars in the bubble‘s interior may have driven away the gas, but this is inconsistent with measured wind velocities in the bubble. Another possibility, since the nebula is filled with massive stars that would expire in titanic explosions, is that the expanding shells of old supernovae sculpted the cosmic cavern...Astronomers have found one supernova remnant in the vicinity of the superbubble and identified an approximately 5 million year difference in age between stars within and at the rim of the superbubble, indicating ...
商品コード: 2021110404762
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