Three billion miles away on the farthest known major planet in our solar system, an ominous, dark storm -- once big enough to stretch across the Atlantic Ocean from Boston to Portugal -- is shrinking out of existence as seen in pictures of Neptune taken by NASA's Hubble Space Telescope.
A planet can be no bigger than about 10 times the size of Jupiter, an astrophysicist has calculated.
The hottest point on a gaseous planet near a distant star isn't where astrophysicists expected it to be -- a discovery that challenges scientists' understanding of the many planets of this type found in solar systems outside our own.
A study of 909 planets and 355 stars reveals that, unlike our solar system, other planetary systems are distinguished by strict regularity.
Speeding through the atmosphere high above Jupiter's equator is an east-west jet stream that reverses course on a schedule almost as predictable as a Tokyo train's. Now, a research team has identified which type of wave forces this jet to change direction.
Immense northern storms on Saturn can disturb atmospheric patterns at the planet's equator, finds the international Cassini mission.
Forty years ago, the twin Voyagers spacecraft were launched to explore the frontiers of our solar system, and have since made countless discoveries, including finding magnetic bubbles around two of the outer planets.
A giant planet, which should not exist according to planet formation theory, has been discovered around a distant star.
Jupiter's intense northern and southern lights pulse independently of each other according to new research.