Outer solar system

  • Neptune Starts Forty-Year Spring
    Long-term observations of Neptune by the Hubble Space Telescope point to a changing season. When spring breaks on the ice-planet, it can last for decades. Cloud cover suggests that the planet's climate is changing.
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  • Fire and Ice
    Pluto, the only planet never visited by a spacecraft, is about to lose that distinction. NASA announced plans to visit the farthest reaches of our solar system, along with a journey to its innermost depths. Missions are now slated for fiery Mercury and to the
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  • Companions for Ice-Planet Neptune
    New moons have been found orbiting Neptune, one of our solar system's giant ice ball planets. The moons are the first found from ground-based telescopes in more than half a century.
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  • Beyond Pluto: Ice Planet
    The Hubble Telescope astronomers have found beyond Pluto, a distant object with the volume of all the asteroids combined. Unlike the long-contested 'Planet X', this candidate is one of a myriad of exotic, comet-like worlds (otherwise known as 'Kuiper Belt Objects', or KBOs).
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  • Voyage of The Voyagers: First Quarter-Century
    When initially launched on August 20, 1977, the Voyager missions to Jupiter and Saturn were considered mission-capable for around 5-year lives. But after 25 years, there is a good chance that another 25 years for their tour is on-course.
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