Category Astronomy/Space

This sparkling burst of stars is Messier 75. It is a globular cluster: a spherical collection of stars bound together by gravity. Clusters like this orbit around galaxies and typically reside in their outer and less-crowded areas, gathering to form dense communities in the galactic suburbs.

Messier 75 lies in our Milky Way galaxy in the constellation of Sagittarius (the Archer), around 67,000 light-years away from Earth. The majority of the cluster’s stars, about 400,000 in total, are found in its core; it is one of the most densely populated clusters ever found, with a phenomenal luminosity of some 180,000 times that of the Sun...

Scholars at the Institute for Advanced Study (IAS) recently submitted a paper announcing the discovery of six new binary black hole mergers that exceed the detection thresholds defined by the LIGO-Virgo Collaboration (LVC), the group responsible for the first direct observation of gravitational waves on February 11, 2016.

Taking data made public by the LVC, the IAS team applied a unique set of signal processing techniques to detect these cataclysmic events, nearly doubling the total number of binary black hole mergers found during LVC’s second ...

The recently-discovered atmospheric glow is both like typical auroras and distinct from them. The celestial phenomenon known as STEVE is likely caused by a combination of heating of charged particles in the atmosphere and energetic electrons like those that power the aurora, according to new research...

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The new measurements, published April 25 in the Astrophysical Journal Letters, reduce the chances that the disparity is an accident from 1 in 3,000 to only 1 in 100,000 and suggest that new physics may be needed to better understand the cosmos.

“This mismatch has been growing and has now reached a point that is really impossible to dismiss as a fluke...