Accretion as a research area investigates the physical processes by which diffuse material gravitationally aggregates to form larger astrophysical structures, including planets, stars, black holes, and galaxies. It encompasses the study of accretion disks, angular momentum transport, magnetohydrodynamic instabilities, radiative transfer, and the interplay between accretion flows and outflows or jets. This field integrates analytical theory, numerical simulations, and multiwavelength observations to quantify mass accretion rates, efficiency of gravitational energy conversion into radiation, and feedback on the surrounding medium, thereby constraining models of structure formation, compact object growth, and high-energy phenomena in various cosmic environments.
Astronomers have an answer for a long-running mystery in astrophysics: why is the growth of supermassive black holes so much lower today than in the past? A study using NASA's Chandra X-ray Observatory and other X-ray telescopes ...
Astronomy
Mar 24, 2026
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New UNLV-led research is helping to unravel clues to a cosmic mystery that has eluded scientists for decades. Cataclysmic variables (CVs) are binary star systems in which primary stars—incredibly dense and compact white dwarfs—accumulate ...
Astronomy
Mar 23, 2026
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An international team from China and Italy has reported a possible cosmic encore to the landmark 2017 multi-messenger discovery. In November 2024, the LIGO-Virgo-KAGRA observatories detected gravitational waves from a binary ...
Astronomy
Mar 13, 2026
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Astronomers have for the first time seen the birth of a magnetar—a highly magnetized, spinning neutron star—and confirmed that it's the power source behind some of the brightest exploding stars in the cosmos. The finding ...
Astronomy
Mar 11, 2026
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Indian astronomers have investigated an ultraluminous X-ray pulsar in the galaxy NGC 4631, designated X-8. The new study, described in a paper published Feb. 16 on the arXiv preprint server, provides essential information ...
When astronomers look out into the cosmos, they see supermassive black holes (SMBH) in two different states. In one state, they're dormant. They're actively accreting only a tiny amount of matter and emit only faint, weak ...
Astronomy
Jan 28, 2026
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Using various space telescopes and ground-based facilities, astronomers have performed X-ray and radio observations of an accreting millisecond X-ray pulsar known as MAXI J1957+032. Results of the observational campaign, ...
New theoretical models have strengthened the case that immense, energy-harvesting structures orbiting their host stars could exist in principle in distant stellar systems. With the right engineering precautions, calculations ...
An international research team led by scientists at Waseda University and Tohoku University has discovered an extraordinary quasar in the early universe that hosts one of the fastest-growing supermassive black holes known ...
Astronomy
Jan 22, 2026
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Young stars need time to grow into their final masses before they begin fusing lighter elements into heavier elements as main-sequence stars. They can spend hundreds of thousands of years as protostars, when they're still ...
Astronomy
Jan 19, 2026
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