How Much of Dark Matter Is Made Up of Tiny Black Holes?
Is dark matter actually ancient black holes the size of planets? New research places a limit on how much of the universe’s most mysterious matter could be made up of tiny black holes.
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Charting the Cosmic Shoreline: Which Planets Have Atmospheres?
New observations of the M-dwarf exoplanet Gliese 486b help astronomers map the location of the cosmic shoreline, which separates planets with atmospheres from those without.
New Species of Dwarf Galaxy in the Galaxy Cluster Ecosystem?
Astrobites reports on the potential discovery of a dark-matter-free dwarf galaxy hiding in the tentacle of a jellyfish galaxy.
Celebrating 175 Years of The Astronomical Journal
The Astronomical Journal turns 175 this month — join us in celebrating the journal’s impact and looking back on its history.
Pointing to the Poles of Brown Dwarfs: Polar Vortex Possibilities
Often characterized as “failed stars,” brown dwarfs are cool, cloudy objects that are not fully understood. Could their poles be home to swirling winds that drive intriguing observational trends?
Old Telescope, New Tricks: Chasing Gravitational Waves Across the Sky
How can we track down colliding neutron stars as quickly as possible? New research shows that the nearly 20-year-old Swift Observatory might be our best bet.
The Galactic Golden Child Cassiopeia A Through the Lens of JWST
Astrobites reports on JWST observations that get up close and personal with the famous supernova remnant Cassiopeia A.
A Bubbly Origin for Odd Radio Circles
New simulations show how odd radio circles could form when supermassive black hole jets blow bubbles in intergalactic gas.
Discovery of a Lonely Galactic Hedgehog
The Hedgehog galaxy is one of the most isolated dwarf galaxies known — but despite its serene location, it might not have formed any new stars in the past 100 million years.
Featured Image: Finding Swirls on Jupiter
Citizen scientists have identified 7,000 swirling vortices on Jupiter, leading to some surprising findings.
Down to the Core: Dark Matter Deviations in Ultra-Faint Dwarf Galaxies
Does the standard cold dark matter model of the universe work on small scales? The dark matter distributions of ultra-faint dwarf galaxies seem to deviate from what is expected, implying a need to rethink how dark matter behaves.
Monthly Roundup (Halloween Edition): Graveyards of Shredded Stars
Researchers have identified dozens of stars tidally disrupted by black holes, and upcoming surveys may discover 1,000 of these rare events each year. Today’s Monthly Roundup introduces three studies that have advanced our understanding of shredded stars.