Protoplanetary disks are classified into three main categories: transition, ring, or extended. These false-color images from the Atacama Large Millimeter/submillimeter Array (ALMA) show these classifications in stark contrast. On left: the ring disk of RU Lup is characterized by narrow gaps thought to be carved by giant planets with masses […]

Artist’s conception of the distant quasar P172+18, with its jets of particles propelled outward at nearly the speed of light. Credit: ESO/M. Kornmesser Quasar also can serve as ‘beacon’ for studying closer objects. Astronomers using the National Science Foundation’s Karl G. Jansky Very Large Array (VLA) and Very Long Baseline […]

GBT-VLBA radar image of the region where Apollo 15 landed in 1971. The snake-like feature is Hadley Rille, a remnant of ancient volcanic activity, probably a collapsed lava tube. The crater at top, alongside the rille, is called Hadley C and is about 6 kilometers in diameter. This image shows […]

The VLBA image of the blazar PSO J0309+27 is composed of data from three observations made at different radio frequencies. Red is from an observation at 1.5 GHz; green from 5 GHz; and blue from 8.4 GHz. The lower-frequency, or longer wavelength, data show the large-scale structure of the object; […]

Artist’s conception of a galaxy with an active nucleus propelling jets of material outward from the galaxy’s center. Credit: Sophia Dagnello, NRAO/AUI/NSF Astronomers using data from the ongoing VLA Sky Survey (VLASS) have found a number of distant galaxies with supermassive black holes at their cores that have launched powerful, […]