Very Large Array (VLA) tagged posts

Astronomers have observed a black hole burping up stellar remains years after it shredded and consumed the star. In October 2018, a small star was ripped to shreds when it wandered too close to a black hole in a galaxy located 665 million light years away from Earth. Though it may sound thrilling, the event did not come as a surprise to astronomers who occasionally witness these violent incidents while scanning the night sky.

But nearly three years after the massacre, the same black hole is lighting up the skies again — and it hasn’t swallowed anything new, scientists say.

“This caught us completely by surprise — no one has ever seen anything like this before,” says Yvette Cendes, a research associate at the Center for Astrophysics | Harvar...

ALMA image of HL Tau at left; VLA image, showing clump of dust, at right. Credit: Carrasco-Gonzalez, et al.; Bill Saxton, NRAO/AUI/NSF

New images of a young star made with Very Large Array (VLA) reveal what scientists think may be the very earliest stages in the formation of planets, 450 light-years from Earth. A previous 2014 ALMA image showed gaps in the disk, presumably caused by planet-like bodies sweeping out the dust along their orbits. This image, showing in real life what theorists had proposed for years, was surprising, however, because the star, called HL Tau, is only about a million years old – very young by stellar standards.

The ALMA image showed details of the system in the outer portions of the disk, but in the inner portions of the disk, nearest to the young star, the thick...