Minutes-duration optical flares with supernova luminosities
In recent years, certain luminous extragalactic optical transients have been observed to last only a few days 1. Their short observed duration implies a...
Nearly all the sky is covered by Lyman-α emission around high-redshift galaxies
Galaxies are surrounded by large reservoirs of gas, mostly hydrogen, that are fed by inflows from the intergalactic medium and by outflows from galactic winds...
Nightside condensation of iron in an ultrahot giant exoplanet
Ultrahot giant exoplanets receive thousands of times Earth's insolation 1,2. Their high-temperature atmospheres (greater than 2,000 kelvin) are ideal...
No surviving evolved companions of the progenitor of SN1006
TypeIa supernovae are thought to occur when a white dwarf made of carbon and oxygen accretes sufficient mass to trigger a thermonuclear explosion. The accretion...
Observation of inverse Compton emission from a long γ-ray burst
Long-duration γ-ray bursts (GRBs) originate from ultra-relativistic jets launched from the collapsing cores of dying massive stars. They are characterized by an...
Optical detection of meteoroidal impacts on the Moon
Impacts of meteoroids on the Moon should cause detectable optical flashes, but the population of objects that are big enough is very low, and hitherto no...
Photochemically produced SO<SUB>2</SUB> in the atmosphere of WASP-39b
Photochemistry is a fundamental process of planetary atmospheres that regulates the atmospheric composition and stability 1. However, no unambiguous...