1. Astronomy

    Probes find a new plume on Io

    Two spacecraft jointly eyeing Jupiter's moon Io, the most volcanically active body in the solar system, have spotted a towering new plume.

  2. Astronomy

    A comet’s odd orbit hints at hidden planet

    Far beyond the solar system's nine known planets, a body as massive as Mars may once have been part of our planetary system, and it might still be there.

  3. Astronomy

    A Dark Force in the Universe

    Cosmologists are thinking dark thoughts about what kind of mystery force may be contorting the cosmos, pushing galaxies apart at a faster and faster rate.

  4. Astronomy

    Starry Data Support Revved-Up Cosmos

    Astronomers have confirmed one of the weirdest properties of the universe: Some mysterious force is pushing galaxies apart at a faster and faster rate.

  5. Astronomy

    Some of galaxy’s dark matter comes to light

    A new study adds to the evidence that astronomers have unveiled some of the dark matter in our galaxy and that it's pretty ordinary stuff—white dwarfs, the cold, compact embers of low-mass stars.

  6. Astronomy

    Creating a warmer, wetter Mars

    A new study adds to the evidence that past volcanic activity could have temporarily created a warmer, wetter Mars, a place on which water once flowed freely.

  7. Astronomy

    Magnetic flip heralds solar max

    Scientists have found another indicator that the sun has reached the maximum of its current activity cycle: The polarity of its magnetic field has reversed.

  8. Astronomy

    In moon race, Saturn is still champ

    New discoveries have raised the retinue of Saturn's known moons to 30, making the ringed planet the solar system's champ.

  9. Astronomy

    Mining the Sky

    A proposed national virtual observatory, a mammoth computer database integrating spectra, images, and other information covering the entire sky, could usher in a new age of discovery in astronomy.

  10. Astronomy

    Cassini at Jupiter: Eyeing the Io torus

    The Cassini spacecraft has captured the most detailed images ever taken of the Io torus, a doughnut-shaped ring of charged particles that surrounds Jupiter and is replenished by the planet's moon Io.

  11. Astronomy

    Ancient Mars water: A deep source?

    A new analysis of a Mars meteorite that fell to Earth suggests that much of the water believed to have once flowed on the surface of the Red Planet came from eruptions of molten rock that originated deep within the planet.

  12. Astronomy

    Distant cluster suggests low-weight cosmos

    Lured by the radio beacon of a faraway galaxy, astronomers have discovered the most distant cluster of galaxies known in the universe.