Q How many galaxies are in the universe? — Gus Powvens, Madison, Wis. A Jim Lattis, director of the UW Space Place at the University of Wisconsin-Madison: Galaxies are clouds of stars that range in ...
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Peering into the Cosmic Abyss How Cutting-Edge Surveys and Spacecraft Are Redefining the Universe’s Galaxy Count
“We see at most 3% of the universe,” said Pamela Gay of the Planetary Science Institute, citing a mind-boggling constraint that envelops each effort to respond to one of astronomy’s most venerable ...
Dark matter plays a crucial role in galaxy formation by acting as a gravitational “glue” that helps pull gas together to form ...
In 1925, Edwin Hubble's observation of Cepheid variables in the Andromeda galaxy revolutionized astronomy, proving the ...
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How is the total mass of the universe calculated?
Astronomers use many methods to determine this number, including gravitational lensing, the universe’s expansion rate, and ...
Astronomers uncovered seven dust-shrouded quasars from Cosmic Dawn, doubling the known tally of early supermassive black holes.
Galaxies are clouds of stars that range in both size and composition. Some contain hundreds of millions of stars while the largest galaxies can contain trillions of stars. And while it’s not entirely ...
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