In a cosmology framework that proposes the universe began with a period of contraction before the Big Bang, researchers find that high-frequency gravitational waves oscillate in a way that is potentially detectable.

Polarization measurements show evidence of shock compression and possible interaction between a supernova remnant and previously formed circumstellar shells from the progenitor’s mass loss.

The presence of a 34-solar-mass brown dwarf companion to an ultra-hot Jupiter suggests that the hot Jupiter must have formed within 1.5 au of its host star to remain dynamically stable.

Using gravitational flow simulations, researchers link smooth areas on the face of a comet to a single event 600–1,200 years ago, possibly connected to multiple close encounters with Jupiter.

Sgr A East strongly overlaps with plasma associated with the Milky Way’s central supermassive black hole, but new efforts to disentangle this emission have successfully isolated the remnant’s emission.

Slightly smaller than Jupiter but roughly 80 times as massive, TOI-2155b can provide a valuable test for models of stellar-mass objects near the hydrogen-burning mass limit.