Almost all blue supergiants shimmer in brightness because of waves on their surface. Blue supergiants are rock-and-roll: they live fast and die young. This makes them rare and difficult to study. Before space telescopes were invented, few blue supergiants had been observed, so our knowledge of these stars was limited...
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Up to half of Earth’s ocean water may have come from impacts by asteroids. Two cosmochemists at Arizona State University have made the first-ever measurements of water contained in samples from the surface of an asteroid. The samples came from asteroid Itokawa and were collected by the Japanese space probe Hayabusa.
The team’s findings suggest that impacts early in Earth’s history by similar asteroids could have delivered as much as half of our planet’s ocean water.
“We found the samples we examined were enriched in water compared to the average for inner solar system objects,” says Ziliang J...
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May 5, 2019,
Astronomy/Space
NGC 2903 is located about 30 million light-years away in the constellation of Leo (the Lion), and was studied as part of a Hubble survey of the central regions of roughly 145 nearby disk galaxies. Few of the universe’s residents are as iconic as the spiral galaxy...
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Astronomers have put together the largest and most comprehensive “history book” of galaxies into one single image, using 16 years’ worth of observations ...
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