Both solar flares were X-class events, the most intense and energetic storms the Sun can emit.
The burnt-out star has one side composed of hydrogen and the other composed of helium. Astronomers have never seen anything like it.
A geomagnetic solar storm is forecast to make the aurora borealis visible in much of the lower 48 on Thursday night. Here's where to look.
Astronomers argue that a recent study forecasting a relatively imminent stellar explosion misses the mark.
The ever-brighter nights on Earth are making it hard for luminous insects to find each other.
The small spacecraft stared straight at the source of solar wind, likely uncovering the process that drives the violent bursts of plasma.
13.5-billion-year-old clouds are poor in iron, suggesting they precede the dissemination of heavier elements.
A new analysis of citizen science reports indicates that light pollution is intensifying around the world.
A quasar’s elemental makeup indicates it’s very, very ancient.
New research in flies makes blue light sound awfully scary, but there's little evidence that humans are being harmed by light from our devices.
The U.S. also warns some unlucky folks could potentially experience power outages and radio signal issues as a ‘cannibal’ CME plays with Earth's magnetic field.
These gorgeous images of the sky are shortlisted in Royal Observatory Greenwich’s annual Astronomy Photographer of the Year competition.
ESA's Gaia detected unusual 'starquakes' during its third survey of the galaxy.
Here's what Solar Orbiter saw during its recent close approach of the Sun.
A nearly 13-billion-year-old star named Earendel will be an early test for the Webb Space Telescope.
The Solar Orbiter probe was 46 million miles from the Sun at the time the extraordinary image was taken.
The Local Bubble is probably the result of millions of years of stellar explosions.
Some supergiant stars experience significant internal changes before going supernovae, according to new and unprecedented astronomical observations.
A Sun-like star just sent out a flare 10 times larger than any previously observed.
A white dwarf star is flinging material from its companion as it spins a record-breaking speed.
