A search for the hypothesized Planet Nine has found no planet with the predicted characteristics; 78% of the parameter space for this planet has now been ruled out.

The upcoming Galactic Bulge Time Domain Survey is posed to discover extended structures composed of dark matter, such as dark matter subhalos, boson/axion stars, and halo-dressed primordial black holes.

New work shows how the total free magnetic energy, the length of the polarity inversion line, and other factors can predict whether a solar active region will generate a C-, M-, or X-class solar flare.

Researchers measured 75 spectral lines from 19 different molecules in the spectrum of CW Leonis, an asymptotic giant branch star that is rich in carbon and surrounded by a sooty cloud.

An ongoing survey of massive galaxy clusters has obtained extremely deep infrared observations that will provide a strong constraint on galaxy formation models.

Bar lanes channel gas toward the center of the Milky Way, and some of the gas may overshoot the center of the galaxy and collide with the other bar lane rather than accreting onto the galactic center.