December 6, 2005 at 8:52 am | Leave a Comment
There IS more to the universe than meets the unaided eye. That’s the story I told in one of my planetarium shows, “More Than Meets the Eye” and I’m stickin’ to it. Here’s why: each time you shift wavelength “regimes” and look at the sky, you learn more about what makes objects tick. Take the Andromeda Galaxy for example (since it’s high overhead in northern hemisphere skies these early winter evenings).
This is the typical picture we see of Andromeda. Beautiful, and since it’s the closest spiral galaxy to us, a great example of the general structure of spirals. However, if you look at Andromeda in the infrared, the image changes dramatically.
Suddenly the spiral rings pop into view much more clearly. The dust regions are glowing, and where there’s warmed dust, there’s action going on. In this case, the action comes from hot stars (and other hot events) warming up the surrounding clouds of dust.
You can read more technical detail about this astonishing “infrared makeover” of Andromeda Galaxy at the Spitzer Newsroom, but for now, just compare and contrast the visible-light image with the two infrared images of our nearest spiral neighbor. Lovely, isn’t it?
December 3, 2005 at 23:24 pm | Leave a Comment
I am a sucker for starbirth regions. This past week while working on the Griffith Observatory exhibit project, I was browsing around various observatory websites, looking for smacking good images of starbirth regions. While we were looking for some specific objects inside stellar nurseries, I couldn’t help but be dazzled by this one (although we ended up not using it).
What we’re seeing here is a snapshot in time well into the birth process of hot young stars, and as an added bonus, a scattering of smaller young stellar objects which haven’t quite started to convert hydrogen to helium in their cores. All the newborn objects in these clusters are embedded in their birth cloud of gas and dust, giving us a pretty nice look at several stages in the formation process of stars. The dark dust clouds could be harboring more incipient stars, but they’re being eaten away by radiation from the brightest nearby stars. So, if there ARE any about-to-be-born stars in the clouds, their gas and dust supply may get vaporized by the hot winds blowing off the older stellar siblings.
To read more about this beautiful starforming region, go here.
The stars in this image are more massive that our Sun. But, you kinda have to wonder what our own neck of space looked like when the Sun was being born. AS we all know, it formed about 4.5 billion years ago in a cloud of gas and dust, probably along with a bunch of stellar siblings.
As it turns out, the Spitzer Space Telescope has a great image of sunlike stars in formation. Check it out.
This is quite a bit more interesting because this could well be what we looked like, way back when. The wisps of material are shock fronts in the stellar birth cloud that are carved out by jets streaming from the stellar newborns. What we’re seeing here is an infrared view, not what our eyes would detect. But, Spitzer excels in looking at the glow of infrared radiation emitted by hot young objects that are warming up the nearby clouds of gas and dust. If you want to look at this picture in more detail, go here and click on one of the larger images.
See why I love these regions? They just excite the eye—and the imagination!
November 26, 2005 at 10:12 am | Leave a Comment
What do you see here? When I first saw this image taken by Gemini Observator’s Travis Rector, I thought to myself, “hmmm… interesting dust cloud and nebula.”
Peter Michaud, Gemini’s Public Information Officer, sent it to me along with a press release for me to edit. We chatted about the image, and he asked me if I thought it looked like a Chinese dragon. Up until that moment, I’d been thinking it looked like the snout of a bull, or some cosmic graffiti. A Chinese dragon hadn’t occurred to me.
The fact that the two of us could see such different things in it, all recognizable, is a fine example of pareidolia, the perception of a pattern or meaning in something that is actually ambiguous or random (see The Word Spy for other examples of targeted perceptions of random objects or patterns). If you’ve ever looked up at clouds in the sky and seen ships or cats or capering clowns, then you’ve been engaging in pareidolia.
A lot of space photos lend themselves to some wonderful flights of imagination. One of my favorites is the Eskimo Nebula.
Hubble Space Telescope took this image of a planetary nebula that only started to look like this about 10,000 years ago. It was a sun-like star, and in another 10,000 years it may look very different, as the wisps of its atmosphere continue to spread out through space.
That’s part of the beauty of pareidolia—it has an essentially fleeting quality. Wait long enough and the thing you thought you saw, like the ship in the clouds, goes away as the cloud dissipates. Wait long enough (in cosmic time) and the Chinese Dragon and the Eskimo will go away, too. Enjoy ‘em while you can!
November 16, 2005 at 11:55 am | Leave a Comment
Over the years I’ve given public science lectures in a bunch of different venues. The topics have been pretty varied, ranging from the cool stuff the Hubble Space Telescope shows us to talks about comets or my job (back when I was an editor at Sky & Telescope). My two favorite types of venues are science-fiction (and Trek-type) conventions and public star parties.
When I first started doing this, there would usually be a good turnout of folks, particularly at the star parties and Trek conventions. After all, there’s a fair amount of interest in space and astronomy in both crowds.
I remember my first Trek convention, when I was asked to come in and talk about HST science. The telescope was launched the year before and we were starting to see some pretty cool science come down. They put me in a huge auditorium and I remember thinking that I’d be lucky if I had 20 people. I shouldn’t have worried: I had 20 Klingons in full battle dress show up and take the front rows, and the auditorium filled up quickly.
Fast-forward a few years to last year, when I was a guest speaker and panelist at the World Science Fiction convention. The science interest was really high at that conference, the rooms where I sat in as a guest panelist for various discussions were filled to overflowing. One of the panels I guested on was a rousing discussion of whether or not we should terraform Venus! The science topics were cogently presented and it was a great time.
Later in the day, I was supposed to present a talk for children about the stars and planets. I was lucky to get three kids and they were tired and irritable. It was something of a disappointment, but then again I couldn’t tell if the face-painting and “make a sword” class was just simply more popular than somebody talking about the stars and planets. Or maybe stars and planets just weren’t on their radar screens.
Which leads me to wonder about what interests folks about space these days. We have no shortage of great news from the major observatories, the rovers on Mars, and the spacecraft at Saturn. The Chinese are well on their way to space exploration, although their accomplishments didn’t get much press in the U.S. (which I think is too bad because it’s a lot of very tough work to get stuff into space and anytime somebody can launch something and not have it go “plonk” into the drink they should be lauded for it).
Certainly we have the ability to look out to nearly the beginning of time with our ever-more-powerful astronomical instruments. That’s an amazing feat that is somehow not as interesting as the current debates on whether or not we should be teaching religion in science classrooms. I have to wonder if all science will succumb to this debate, even the very real and tangible discoveries we’re making in the cosmos each day.
A more important question, perhaps, is to ask ourselves what we know about science. What do we really know and what do we WANT to know? For many people, science is still this scary subject, along with math, that people have to endure in school. Which is too bad, because it’s not really as bad as people make it out to be. Which leads me to wonder if the anti-science sentiment we see in some people isn’t fear of understanding, masking itself as false pride in a non-accomplishment.
Think about it. Why is pride in being dumb or afraid of science such a great thing? What does this say about a person? What happens to the kids who think space is cool and say so when they see a great picture in the paper? Why can’t we harness this more effectively to bring the wonder of science to people (and not frighten them)? Or, are we living among people who think, as Barbie was once programmed to say, “Science is hard” even as they are surrounded by some of the most amazing science ever shared?
Look around in your newspaper or local events notices and see how many public science lectures there are in your area. If there aren’t any, ask yourself why. Science is such an important part of our lives, yet it is increasingly coming under fire from public officials, religious officials, and regular people — each attacking it for their own reasons. Yet, if it weren’t for science, we wouldn’t have the means to attack it — the TV shows, the blogs, the books, the newspaper reporters who report the “debates” between science and religion as spectacle…
Does anybody care about science for its own sake anymore?
November 12, 2005 at 16:32 pm | Leave a Comment
I love it when we get conversations going in comments here. I wish I had time to administer a bulletin board system, but right now work is keeping me from having that time. The work is great, by the way. The exhibits are coming along, the writing is great fun!
So, the current conversation about “fear of science” reminds me that we, as humans, do what we can to “humanize” science. This brings us to things like planetarium shows and places like science museums. And that’s great, although I do sometimes think that having a special museum for science, or even art for that matter, gives people the idea that science (or art) is something you have to go experience. Rather we should remember that science is all around us — or rather, the processes that science describes, occur all around us. We ARE science, just like we ARE starstuff.
One of the “humanizing” efforts in astronomy is this whole deal about paying some company to take a star and attach your (or someone else’s) name to it. That’s kind of strange, I think, since you can go out and do this for free. You don’t have to pay some company for a cheap certificate and a (sometimes) illegally copied star map with a circle around a star that somehow implies that you just bought the naming rights, like some beer company naming a stadium. Somehow these companies make it look like you’re getting something more for your money though: the chance to have everybody else (usually implying “official astronomers”) call that star by your name.
It just isn’t so, and all the advertising and hearts and flowers in the world isn’t going to make it so. Offering to put the name in a book locked in a Swiss bank vault isn’t going to make it any more official, either.
But, the stars ARE yours. The official names (or non-official ones written in books squirrelled away in some vault), don’t change that. You can go out, anytime, and look up. Fortunately, nobody’s figured out a way to charge you for access to your own backyard and a view of the stars.
I bring this up because companies who stick names on stellar objects do advertise using Google, and occasionally their ads do show up here (even though I filter such stuff out). So, I DO NOT condone such sales, but if an ad slips through, there’s not much I can do about it, even if I have filtered them out. Same with some other whack ads which have shown up here recently. Maybe I should just figure that people are intelligent enough to figure out what’s honest and what isn’t, but the star-monicker business pushes a few buttons for me. I’ve had experiences with people coming up to me after talks and proudly showing me the star they had called after their dearly departed loved one, telling me how proud they were that the whole astronomy community was going to be calling it “Bob’s Star” in perpetuity. And instead of the companies having to deal with the hurt feelings when we tell them people that they’ve kinda wasted their money on something that isn’t quite what they were led to believe, the backsplash comes back to us who love the stars too dearly to imagine them being used in activities that promise things that are usually just too good to be true.
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Copyright 2013, Carolyn Collins Petersen
Image of Horsehead Nebula: T.A.Rector (NOAO/AURA/NSF) and Hubble Heritage Team (STScI/AURA/NASA)
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