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.
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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.
Testing Cosmology with the Dark Energy Survey Five-Year Supernova Dataset
Astrobites reports on tests of cosmological models using measurements of nearly 2,000 supernovae from the Dark Energy Survey and other sources.
Monster Shocks from Collapsing Magnetars
The collapse of a magnetar into a black hole may power the strongest shocks in the universe and produce brief, bright flashes of gamma rays.
Tracing Huge, Distant Structures in the Universe
Space is filled with structures that we can’t see directly. How do astronomers trace the underlying dark-matter distribution of the universe?
Searching Five Million Stars for Disks, Debris, and Dyson Spheres
A data-driven approach identifies stars with interesting infrared emission without relying on computationally expensive modeling.
Star Alignment and a Planet’s Origin: The Case of HIP 65426
Astrobites reports on an analysis of the orbital architecture of JWST’s first directly imaged exoplanet using time-series photometry data from the Transiting Exoplanet Survey Satellite.
Featured Image: Bringing PHANGS Data to Life
Nineteen nearby spiral galaxies surveyed by JWST are presented in one grand ensemble along with a customized image-processing pipeline.
On the Run: Hypervelocity Stars and Their Links to Type Ia Supernovae
While Type Ia supernovae have been used to determine cosmological distances and study the expansion of the universe, their origins are still under investigation. Recent simulations point to a double-detonation scenario being the catalyst for some of these extremely energetic events.
Gliese 229 B’s Newfound Companion Solves Brown Dwarf Mystery
New observations show that Gliese 229 B is two brown dwarfs rather than one, resolving the mismatch between its measured mass and predictions of evolutionary models.