Two new studies are attempting to solve a couple of big puzzles in astrophysics: Is the Hubble constant actually constant? And why do galaxies have flat rotation curves? Plus, a young star’s circumstellar disk, the search for stellar-mass black holes, magnesium in the deep waters of Neptune and Uranus, and an interview with PSI scientist David Horvath regarding possibly active volcanism on Mars.
Using spectrographic data from several different telescopes, a team put together a three-dimensional model of planetary nebula NGC 1514, which allowed them to further study the shape and internal motion of the object. Plus, Antarctic sea ice, a history of current flow, magnetic waves, and an interview with astronaut Cady Coleman.
A tiny black hole, only three solar masses, has been found inside the Milky Way in the constellation Monoceros. One of the smallest black holes ever found, it is also the closest one to Earth. Plus, Perseverance, Gaia, a brown dwarf, new images of Jupiter, seismic monitoring from space, and this week’s What’s Up.
Researchers found that among about 50 supernovae, many had nearly identical spectra, paving the way for making more accurate distance calculations. These calculations, in turn, open up the possibility of using supernovae to better search for dark energy. Plus, OSIRIS-REx, Voyager I, planetary formation, and volcanoes on Mars.
Two new studies used data from Cassini’s Grand Finale observations of Saturn and found that the magnetic fields and a wave in the rings provide insight into the core structure and composition of the gas giant. Plus, cosmic rays, how Mayans shaped the Earth, and a review of books by Charles C. Mann.
Researchers find that the “oddball supernova” of a curiously cool, yellow star was lacking the hydrogen content expected, “stretching what is physically possible.” Plus, finding potentially habitable planets, a gamma-ray burst, ash clouds, and a new lunar map in this week’s What’s Up.
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