The Sun, now halfway through its life, might be slowing its magnetic activity, which could lead to permanent changes in the sunspots and auroras we see.
A multi-year investigation revealed errors in our understanding of the Sun.
One person can make a difference, as demonstrated by a high-school student's single-handed effort to help us all appreciate the night sky.
The source of December's annual Geminid meteor shower is not what you might expect.
A half hour of target practice paves the way for a high-speed dash comet dash in early 2004.
Although its arrival is still more than two years away, the Cassini orbiter is already drawing a bead on its final destination.
The spacecraft that takes a licking and keeps on ticking is about to make its last flyby.
Fast-moving Mercury can be elusive. But spotting this sparkling little planet is easy if you know where and when to look.
The intrepid Galileo orbiter has been shut down permanently awaiting its burial into Jupiter's atmopshere.
Buried deep within the spiral galaxy M83 is a dense and tumultuous star-making factory in a bagel-shaped volume around the galaxy's nucleus. The Chandra X-Ray Observatory captured this high-resolution image in an hour and a half exposure, also revealing a large population of X-ray binary stars and an envelope of scorching-hot ionized gas, say Roberto…
Europe's Rosetta spacecraft was supposed to be on its way to Comet Wirtanen by now &$151; but a failure of its launch vehicle last month may keep this spacecraft grounded for years.
Scientists are closer to determining what causes the lingering smoke train behind some meteors.
Eleven of Jupiter's moons have received their official names.
The prospects for a mission to Pluto look better than ever.
World-renowned space artists Don Davis and Jon Lomberg have been awarded the prestigious Klumpke-Robert Award by the Astronomical Society of the Pacific.
Never-before-seen details in the inner Crab Nebula reveal that the fast-spinning pulsar at its heart is powering a dynamic sequence of events.