Category Archives: Gemini Observatory

Gateways to the Cosmos

Gemini Observatory
Gemini Observatory

Observatories are our windows to the universe. Through their gates, we can move out to distant realms and explore the lives and deaths of stars, the evolution of galaxies, and the origins of the cosmos. Astronomers used to travel to observatories quite regularly to do their work, which made them appreciative of the distant, lovely places where these facilities are built.

Now you don’t have to go to an observatory to get your data as much as in the olden days (or nights, actually), because many facilities are automated and can deliver your data across the Internet (or in digital format on tape or disk) very quickly. We are in the age of remote observing, and it seems to me to be a natural evolutionary step for astronomers to take. Yet, something is lost, something described in Patrick McCray’s book Giant Telescopes as a romantic link to a past time of astronomical discovery when lonely men (they were almost always men) wrestled with great astronomical beasts atop cold mountaintops. Many important discoveries were made by those men and their machines, and their hard work has led directly from the ways of the “old days” to the methods of today’s astronomers.

Still, that shouldn’t stop us from appreciating the beauty of the mountaintops, even as we revel in the rest of the cosmos that is revealed from their observatories. I think every astronomer should go up a mountain at least once in his or her career, and not just for the heady experience of trying to take data at high altitude (although that’s a hoot, too). You gain a new perspective on the world when you go up the mountain. You get to feel as if you could fall up to the stars when you step outside from the control room during an observing run. And, then there’s the rush you get from knowing that the night you’re up there, you’re one of a handful of human beings across the world who are doing what you’re doing.

In that sense, then, observatories are truly gateways to discovery. It’s just that what you discover isn’t always up in the sky!

Fireworks for the New Year

NGC 6946 as seen by Gemini Observatory
NGC 6946 as seen by Gemini Observatory

For a couple of weeks before the holidays I spent some time working with the guys out at Gemini Observatory on the press release that accompanied this great picture of NGC 6946. It was taken using the Gemini North telescope on Mauna Kea, Hawaii on August 12, 2004 and I first saw it sometime last fall when the public information office sent it to me as part of a press package they wanted me to edit. Cool stuff, really! If you look at the image, you can make out dozens and dozens of red splotches of light scattered throughout the spiral arms. These are starbirth regions, and over the next millions of years they’ll be ablaze with the light from hot young stars.
What you don’t see in a single image like this, however, is the incredibly active rate at which massive stars are blowing up as supernovae. In fact, this galaxy has stars that have been, as scientist Jean-Rene Roy says, “exploding like a string of firecrackers!”
That makes sense for a galaxy that is just swarming with star-formation sites. Eventually all those hot, massive young stars evolve into old, massive ones that are the most likely to explode as supernovae. If we had incredibly long lifetimes, like say billions of years long, we could watch NGC 6946 go through wave after wave of star formation, followed by the protracted struggles of star death.
Unfortunately we don’t, but luckily we have telescopes like Gemini to give us snapshots that show us the evidence for stellar evolution on a grand scale in a neighboring galaxy!