More than a decade after its initial explosion, supernova SN 2004dk still glows at multiple wavelengths, suggesting that the expanding supernova remnant is interacting with circumstellar material.

Atacama Large Millimeter/submillimeter Array data from 2015 to 2021 suggest a far slower movement of the spiral arms in the disk around CQ Tau than would be expected if the putative planet at 20 au were present.

Active galactic nuclei are more common in galaxies deep within cosmic voids than those closer to the edges, and though the cause of this trend is unknown, it may tell us about the effects of rarefied environments on galaxy activity.

Mercury-containing minerals like coloradoite are a possible explanation for the observed properties of Venus’s highlands but would require orders of magnitude more mercury than is seen in meteorites or Earth rocks.

Optical and infrared light curves of Wolf–Rayet 122 reveal a 310-day photometric period, which might be due to the presence of a massive binary companion that is hidden within the star’s dusty nebula.

Serendipitous observations with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) allowed for the identification of a 22-second modulation period in the pulse emission variations of a millisecond pulsar.