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  • A New Star in Space

    Dec. 1, 2000

    Something in the heavens is growing brighter and it will soon become one of the most eye-catching stars in the night sky. No it's not a supernova. It's the International Space Station!

  • The Indefatigable Ions of Deep Space 1

    Aug. 17, 2000

    NASA's Deep Space 1probe, en route for an encounter with Comet Borrelly, has run its unique propulsion system for more than 200 days -- longer and more efficiently than anything ever launched. The ion engine is very slow to pick up speed, but over the long haul it can deliver 10 times as much thrust per pound of fuel as more traditional rockets.

  • The Incredible Shrinking Ozone Hole

    Dec. 12, 2000

    After reaching record-breaking proportions earlier this year the ozone hole over Antarctica has made a surprisingly hasty retreat.

  • Howling for Snow

    April 14, 2000

    The sled dogs of California's Eastern Sierra are unhappy. Why? A persistent La Nina condition in the Pacific has left the mountain range with less than its usual supply of snow. As data continue to flow in from Earth orbit, NASA scientists are working to understand how El Nino and La Nina affect our global climate.

  • The Humming Black Hole

    May 15, 2000

    A black hole binary star system called XTE J1550-564 has recently become one of the brightest sources in the sky at x-ray wavelengths. Astronomers are fascinated by fluctuations in the x-ray emission from this source, which if converted to sound waves would feel like the deep rumbling vibrations from a bass speaker at a rock 'n roll concert.

  • The Incredible Ions of Space Propulsion

    June 16, 2000

    After nearly 40 years of development and the successful flight of Deep Space 1in 1998-1999, ion propulsion has now entered the mainstream of propulsion options available for deep-space missions.

  • Cosmic Bar Codes

    Feb. 22, 2000

    The Chandra X-ray Observatoryhas peered into the nucleus of a distant galaxy and detected warm gas flowing away from a black hole. The spectrum of active galaxy NGC 5548 is the most precise of its kind ever made with an x-ray telescope.

  • Editor's Note for Asteroids Have Seasons, Too

    June 20, 2000

  • Making a Splash on Mars

    June 29, 2000

    On a planet that's colder than Antarctica and where water boils at ten degrees above freezing, how could liquid water ever exist? The prospects for life on Mars, both human and martian, could hinge on the answer. In this story, experts discuss conditions on Mars and ways to keep water flowing on the red planet.

  • The Stuff Between the Stars

    July 31, 2000

    The cosmos is laced with tiny specks of dust that decide the fate of young stars and planets. Now, NASA scientists here on Earth can study the properties of far-flung space dust using special laboratory facilities at the Marshall Space Flight Center.