On April 25, 2009, I participated in a global webcast for about 400 boy scouts at Camp Durant  in North Carolina. What made it a "global webcast" is that they included speakers from not just the USA, but also the Netherlands, Canada, and Australia.

My talk was entitled "Visions of Orion: from Galileo to Hubble". My slides are posted below.

The main point of my talk was how our view of the Orion Nebula has changed since the invention of the telescope. I used examples from Galileo, Christiaan Huygens, Charles Messier, Henry Draper, Lick Observatory, and the Hubble Space Telescope as illustrations. This presentation roughly parallels the panel on "Star Birth in Orion" in the "Visions of the Universe: Four Centuries of DIscovery" travelling exhibit that I curated.

Here are the slides of the presentation, along with a bunch of extra slides about the Orion Nebula:

• PDF format (1.8 MB)
• PowerPoint format (1.8 MB)

Here are the links from the last slide in the prsentation:

• Visions of the Universe exhibit
• Hubble's Universe Unfiltered video podcast
• My twitter page

If the webcast is posted in a public place, I'll put the link here. Enjoy!