Science With Two Big Telescopes

I’m at a meeting again this week, this time in Vancouver, British Columbia, with more than 100 scientists who have gathered to talk about the science they’ve done using the twin Gemini telescopes. It’s a sort of watershed moment — a celebration of very successful science being done with two 8-meter telescopes that even a decade ago were still under in the planning stages, getting ready for construction.

If you’re into reading what the Gemini researchers — who hail from all over the world — are up to, check out this agenda of papers being given at the meeting. Some of it may seem pretty “far out” and it is, but in a very nice, cosmic way that is giving us an even greater sense of the origins and evolution of the galaxies, stars, and worlds that make up the universe.

Back when I was in graduate school, I often wondered if we had discovered it all, if the big questions had been answered. I suppose every generation thinks they’ve answered the big questions and ‘been there, done that.’ Well, the more I see and hear from astronomers who are “out there” on the forefront of discovery, I don’t think our generation, or even the next several, have a monopoly on the “big discoveries.” The universe is a myriad of details, and there will always be more of them to discern…

Back in the Saddle

We just got back from a little time away in Colorado. ‘Twas nice to be there, but is nice to be back home and in the saddle. So, to celebrate, here’s a picture from the Hubble Space Telescope.

The Red Rectangle — a Dying Star Seen By HST
The Red Rectangle — a Dying Star Seen By HST

HST imaged the Red Rectangle some years ago in lower resolution, and returned to it again to capture more details at higher resolution. Now, it’s not really a rectangle, but is shaped more like a fuzzy X. What’s causing the X-star? The star in the center of the Red Rectangle is one that began its life as a star similar to our Sun. It is now nearing the end of its lifetime, and is in the process of ejecting its outer layers to produce the visible nebula. The shedding of the outer layers began about 14,000 years ago.

So, what’s with the ejection of the outer layers? Dying stars like the Sun (and all dying stars, really) go through a process called “mass loss” which involves large amounts of stellar material flowing away from the aging star. In this case the outflows are ejected from the star in two opposing directions. The most amazing thing about this picture are the straight features that appear like rungs on a ladder. These rungs could have formed during successive episodes of mass ejection from the star that have happened like clockwork every few hundred years.

In a few thousand years, the star will have become smaller and hotter, and will begin to release a flood of ultraviolet light into the surrounding nebula; at that time, gas in the nebula will begin to fluoresce, producing what astronomers call a planetary nebula.

Exploring Science and the Cosmos

Spam prevention powered by Akismet