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April 20, 11 a.m. PDT
Getting Time on the Telescope

How much time does an astronomer need to get that great picture? We'll talk with scientists about how they determine their experiments, and learn what it takes to make their case for a few minutes of the telescope's time.

Preshow "warm-up" webcast

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Webcast duration: 1 hour
An archived version will be available one hour after the end of the Webcast.


Today's Guest :
Dr. Melissa A. McGrath, STSci Associate Astronomer

Melissa McGrath specializes in research on the atmospheres, satellites and magnetospheres of the gas-giant planets in our solar system, and has recently begun working in the field of extra-solar planet research. She used her time with Hubble to look at Io, one of Jupiter's moons. Dr. McGrath is also an instrument scientists working on the Cosmic Origins Spectrograph, a new instrument to be installed on HST in 2003.

Above, is Dr. McGrath's favorite HST image. This is an image of Io taken while the moon is in front of Jupiter. You can see a little volcanic plume on the left side of Io, the first time a plume on Io has ever been observed from Earth. (They have been observed by spacecraft near Io, but never before from Earth.)




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