From volcanic landscapes to world-class observatories, a journey through the Canary Islands reveals a night sky unlike anything I'd seen before.
Auroras may be visible from Alaska to Illinois as an incoming coronal mass ejection could disrupt Earth's magnetic field and trigger geomagnetic storm conditions.
Early risers across North America and Europe may spot a bright, silent light gliding across the Christmas sky — and it just happens to coincide with an ISS flyby.
Fast solar wind and a possible glancing blow from a coronal mass ejection could spark auroras over Christmas.
Auroras may be visible from Alaska to Idaho as incoming speedy solar wind continues to buffet Earth's magnetic field.
Today marks the shortest day and longest night of the year as the sun reaches its lowest point in the Northern Hemisphere sky.
A photographer in Italy captured an ultra-rare elve and red sprite flashing above the Alps in a single breathtaking moment.
NASA JPL pinpoints the moment the interstellar visitor passes closest to our planet.
The livestream will now begin Friday at 11 p.m. EST, Dec. 19 (0400 GMT on Dec. 20), weather permitting, after rain prevented a broadcast on Thursday night.
The interstellar comet will pass safely by Earth, giving astronomers their best chance to study it up close.
