Some fast radio bursts might be the result of a black hole lighting up a neutron star.
Planets with radii between Earth and Neptune and small radii are the most common in planetary systems. These planets are challenging to explain with classical models of planets. Do planets form instead in-situ in an inside-out manner?
Some variable stars seem to be “golden”, but is this property fundamental or just chance?
How does hydrogen affect supernovae? A new theory explores inconsistencies between theory and observation.
How to form clumps in the intermediate ranges of massive protoplanetary disks? Could these later be planets?
A model that needs fewest parameters to explain a scenario is favourable. The fact that mm-size dust grains (chondrules) are present in the entire solar system brings rise to the question, whether all bigger solid objects are a collection of chondrules.