What's up in
Universe
Astronomy, cosmology, stars, planets, black holes and the observatories revealing how the cosmos works.
Study suggests Planet 9 is stolen exoplanet
Supermassive black hole wind can stop new stars from forming
Could optical clocks redefine the length of a second
40-year math mystery and 4 generations of figuring
Doubling down on Schrodinger's cat
Engineers discover a new gatekeeper for light
Astronomers find giant planet around very young star
Close encounters of a tidal kind could lead to cracks on icy moons
Supermassive black holes in 'red geyser' galaxies cause galactic warming
A look beyond the horizon of events
