Category Astronomy/Space

Cold Gas Pipelines Feeding Early, Massive Galaxies

Graphic illustrating detection of a cold gas accretion stream in absorption
Researchers led by the University of Iowa have detected cosmic pipelines supplying the cold gases necessary for the formation of massive galaxies and the creation of stars. It is the first direct observational evidence of the phenomenon in the early universe. Image courtesy of Hai Fu.

Researchers have detected cosmic pipelines supplying the cold gases necessary for the formation of massive galaxies and the creation of stars. It is the first direct observational evidence of the phenomenon in the early universe.

To come into being, galaxies need a steady diet of cold gases to undergo gravitational collapse. The larger the galaxy, the more cold gas it needs to coalesce and to grow.

Massive galaxies found in the early universe needed a lot of cold gas — a store totaling as much as 10...

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Apollo Rock Samples capture key moments in the Moon’s Early History

Volcanic rock samples collected during NASA’s Apollo missions bear the isotopic signature of key events in the early evolution of the Moon, a new analysis found. Those events include the formation of the Moon’s iron core, as well as the crystallization of the lunar magma ocean — the sea of molten rock thought to have covered the Moon for around 100 million years after the it formed.

The analysis, published in the journal Science Advances, used a technique called secondary ion mass spectrometry (SIMS) to study volcanic glasses returned from the Apollo 15 and 17 missions, which are thought to represent some of the most primitive volcanic material on the Moon...

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Evidence of dynamic Seasonal Activity on a Martian Sand Dune

Ariel image of airborne plumes of dusty material located on the downwind slope of the Martian megadune
Courtesy of NASA/JPL/University of Arizona The airborne plumes of dusty material located on the downwind slope of this Martian megadune were an important clue, allowing an SwRI scientist to deduce that chunks of frozen CO2, or dry ice, slide down the gullies in the spring, kicking up sand and dust. While actively sliding CO2 ice blocks cannot be observed conclusively in this image, dense clouds of debris likely conceal mobile ice blocks.

Research finds that airborne dust plumes are produced by sliding blocks of dry ice each spring. A Southwest Research Institute® (SwRI®) scientist examined 11 Mars years of image data to understand the seasonal processes that create linear gullies on the slopes of the megadune in the Russell crater on Mars...

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New study suggests Supermassive Black Holes could form from Dark Matter

New study suggests supermassive black holes could form from dark matter
Artist’s impression of a spiral galaxy embedded in a larger distribution of invisible dark matter, known as a dark matter halo (colored in blue). Studies looking at the formation of dark matter haloes have suggested that each halo could harbor a very dense nucleus of dark matter, which may potentially mimic the effects of a central black hole, or eventually collapse to form one. Credit ESO/L. Calçada, CC BY 4.0

A new theoretical study has proposed a novel mechanism for the creation of supermassive black holes from dark matter. The international team find that rather than the conventional formation scenarios involving ‘normal’ matter, supermassive black holes could instead form directly from dark matter in high density regions in the centers of galaxies...

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