Two studies of the Martian atmosphere are changing the way we think about its current climate and its ancient past.
Astronomers are using tree rings as a historical record of solar activity — and they've found that the Sun was much more active in the past.
Jupiter and Saturn fashion the Great Conjunction of 2020 when they pair up on December 21st, the winter solstice. That evening they'll be closest in nearly 400 years.
An object set to pass near Earth next month may in fact be a relic of the early Space Age.
NASA’s Osiris-REX successfully stowed its sample of Bennu's regolith, collected earlier this week. Images show a good haul.
The subtle effect of sunlight may turn the near-Earth asteroid Apophis toward Earth in 2068 . . . but chances for impact remain small.