Tag Archives: galaxy visions

The Hubble Continues To Be A Revelation

John Caldwell of York University in Toronto, Canada, got the ball rolling. He planned to use Hubble for taking spectra of Saturn’s moon Titan as well as the Galilean satellites of Jupiter. To better understand the spectra of sunlight reflected off these objects, however, he needed to test Hubble’s capabilities on another target. The sun was definitely out as a test subject; it shines far too brightly to have Hubble point anywhere near it. So Caldwell chose an object closer to home – the moon.

It’s safe to say that if an outside observer had suggested viewing the moon with Hubble, the proposal wouldn’t have stood much of a chance. But Caldwell had a built-in advantage: He belongs to that rare breed known as Guaranteed Time Observers. As the name implies, these people are assured access