The Great Silence: Where is Everybody? (Video)

Where is everybody? Why haven’t we heard from other civilizations by now? …

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What is Neptune Made Of?

The “ice giant” Neptune, the farthest planet from our Sun, is made up of gases, super-heated liquids, and maybe even diamonds!
The post What is Neptune Made Of? appeared first on Universe Today. …

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Just after the Big Bang: Galaxies created stars a hundred times faster now

A team of astronomers has discovered a new kind of galaxy which, although extremely old — formed less than a billion years after the Big Bang — creates stars more than a hundred times faster than our own Milky Way. …

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How most antimatter in the Milky Way forms: Mystery solved

Astrophysicists have now shown how most of the antimatter in the Milky Way forms. …

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Volunteers help find star that exploded 970 million years ago, predating the dinosaurs

Online volunteers have helped astronomers find a star that exploded 970 million years ago, predating the dinosaurs’ time on Earth. …

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Biggest ever simulations help uncover the history of the galaxy

Thousands of processors, terabytes of data, and months of computing time have helped a group of researchers in Germany create some of the largest and highest resolution simulations ever made of galaxies like our Milky Way. …

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We Have More Details on the Outermost Trappist-1 Planet!

A new study by an international team of researchers has revealed information about the surface conditions on TRAPPIST-1’s outermost planet.
The post We Have More Details on the Outermost Trappist-1 Planet! appeared first on Universe Today. …

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Here’s How We Can Detect Plants on Extrasolar Planets

In a presentation at Breakthrough Discuss, astrophysicist Dr. Berdyugina explained how methods used to study stars could be used to determine the presence of plants on other planets.
The post Here’s How We Can Detect Plants on Extrasolar Planets appeared first on Universe Today. …

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Do Gravitational Waves Permanently Alter the Nature of Spacetime?

A new study by a team of researchers from Monash University argues that gravitational waves may permanently alter the fabric of spacetime.
The post Do Gravitational Waves Permanently Alter the Nature of Spacetime? appeared first on Universe Today. …

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New object near supermassive black hole in famous galaxy

When astronomers took a new look at a famous galaxy with the upgraded Very Large Array, they were surprised by the appearance of a new, bright object that had not appeared in previous images. …

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HI content of isolated UDGs (Papastergis et al.)

Vol. 601
In section 1. Letters

The HI content of isolated ultra-diffuse galaxies: A sign of multiple formation mechanisms?

by E Papastergis, E.A.K. Adams, and A.J. Romanowsky A&A 601, L10

alt

Ultra-diffuse galaxies (UDG) are distinctive because of their extremely low surface density of stars, with respect to the mass and size of their dark matter halo. The latter are derived from their relatively large rotational velocity, and large size. UDG are very abundant in galaxy clusters, and one of the best scenarios is that they have been stripped of their gas by the cluster environment, which stopped their star formation. In isolation, they could be quenched by starburst-driven outflows.
The present article reports of 21cm observations of the HI component in four isolated UDG, leading to three upper limits and one detection. Combining with the literature, this means six field UDG have been observed, with three upper limits. The observed dichotomy in the gaseous properties of field UDGs is interpreted as a sign of the existence of multiple mechanisms for their formation, with the formation of the quiescent gas-poor UDGs remaining a mystery.

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Two Veteran NASA Astronauts Michael Foale and Ellen Ochoa Inducted into U.S. Astronaut Hall of Fame at KSC

KENNEDY SPACE CENTER VISITOR COMPLEX, FL – In a moving ceremony, a pair of veteran NASA astronauts – Michael Foale and Ellen Ochoa – who once flew together on a space shuttle mission, were inducted into the U. S. Astronaut Hall of Fame at the Kennedy Space Center Visitor Complex, Florida, on May 19.
The post Two Veteran NASA Astronauts Michael Foale and Ellen Ochoa Inducted into U.S. Astronaut Hall of Fame at KSC appeared first on Universe Today. …

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