One Astronomer's Noise

Entries from February 2009

Reflections on the Goal of College

February 28, 2009 · 3 Comments

Yesterday’s “Afternoon Inquisition” on Skepchick brought up a very interesting topic that I had relegated to the back-burner of my mind for some time now. MasalaSkeptic asked, “Is college worth it? What are the factors that make it worthwhile?” That’s a huge question with lots of individualized answers.

Obviously, I’m interested in working in an academic field, so college was a necessity to that goal. However, that is a specialized case. It seems that for many college students, their college major is only tangentially, if at all, related to their eventual job or career. Prevailing wisdom is that you need a college degree to get a job, but also that your GPA matters much less than real-world experience. Some say that college is a great place to get that real-world experience, and I agree. But colleges are structured to emphasize classwork and grades more than anything. So where is the disconnect?

When I was a senior at a small, four-year, residential, private, liberal arts institution, I was honored to be a student member of the Curriculum Development Committee. I learned quite a lot about how academic catalogs and degree programs are built and modified. I even co-authored, with another student, the degree requirements for the Bachelor of Science in Physics, gearing it for physics majors who were interested in applying for graduate programs with the hope that it would prepare them for the challenges ahead. I designed my own curriculum to be heavily science and math-based, but also enjoyed immensely the humanities and arts classes that I took for my distribution requirements. After all, it was a liberal arts college and that’s what you do, you get a well-rounded education. It probably helped that I saved most of my humanities classes for senior year, when I was mentally a bit more mature and able to appreciate learning about wide-ranging and unfamiliar topics. (And not worry about my grades, at least once grad school applications were in.) So when the general topic of the goal of a college education came up in committee meetings, I was in agreement with the sentiment that a liberal arts education was the way to go, that learning for the sake of learning was important for all students. Just getting a degree to get a job was unpleasantly utilitarian, although I think I was more strongly in favor of spending more time in major classes and less time in distribution requirements than most of the other committee members.

One of my other functions at that college, in my sophomore and junior years, was as a Student Academic Resource, or STAR. The STARs lived in the freshman dorms and were part of the Resident Life staff, but we focused on academic issues. We put on various educational programs and were the go-to people when freshmen needed to find a tutor or get academic advice. We also worked closely with those students who were in danger of failing after their first semester. That last responsibility had a huge intellectual and emotional impact on me, especially when my first batch of students all dropped out, despite my efforts. Although each case was different, there was a common thread through some of those students, and many that stayed on, where they entered college because of parental pressure, with the hopes of getting a degree to get a job. But they were not really “ready” for college just yet. Some of those students got in touch with me years later to tell me they had gone back to college and were doing well, and that makes me so happy, and confirms my suspicions that it was just the wrong time for them. So in college, my life was split between the nerds who loved learning for learning’s sake, and the students with the job-oriented mindset who just didn’t handle college at all their first time around, all in a little cocoon of a tiny, liberal arts institution.

Needless to say at this point after reading my setup, my views have changed. I’m now a graduate student at a larger university, and I still stay plugged into the classroom mindset through some of my friends who are undergraduates. I see some of the same mindset that I had in college, that being to get your degree with a career goal in mind, but love the learning and life experiences along the way. And I am beginning to appreciate the “get the degree to get the job” mindset a bit more, although it frustrates me sometimes as a tutor and TA to be faced with “I just want to get a good grade because I need this class to graduate.” So it makes me wonder, are colleges and universities doing students a disservice by forcing them to take on a well-rounded, four-year, expensive education? I used to think not, but now I’m not so sure. It may be the creeping college loans of my own, or becoming more aware that most people learn from experiences more than they learn from the classroom. If it is true that some kind of college degree is required to get a satisfying job, then why do colleges expect that all students will be of the mindset of academics? How can individual professors cope with the majority of their intro classes being full of students who are “getting the grade to get out” and still make it a rewarding experience for themselves and for the students? Are colleges and universities of the wrong mindset, and can the system be changed to accommodate a variety of students?

Big questions, no definite answers. But I can see that my own changing opinions are based on new observations and will reflect how I teach in the future.

Categories: education
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Happy BSG Friday!

February 27, 2009 · 3 Comments

WARNING: SPOILER!

I have a few friends that are just starting Battlestar Galactica now. If this is you, don’t watch this video! Only those that are caught up through the last few episodes should watch this. But if you do, you may hurt yourself laughing at the worst product placement EVAR. I don’t know what’s worse, the audio or the visual.

Thanks again to Gail, who shares all the good stuff!

Categories: fun
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Stepping into the intelligent design debate…

February 27, 2009 · 5 Comments

My inbox exploded last week due to two things: a good discussion on editing and publishing our research group’s paper and a debate on Intelligent Design. Luckily, I have my Thunderbird inbox set to view as threaded, so it wasn’t that much of a mess. My paper comments will stay with the PAPER group, but since the ID email thread died before I got my lazy butt around to reading it, I’ll comment here, and link on the VAA blog.

The thread started in response to a Virginia Atheists & Agnostics discussion on intelligent design, which I unfortunately missed. A member of the group who appears to be in favor of ID wrote to the list recommending William Dembski’s 1988 The Design Inference. Dembski is a senior fellow of the Discovery Institute, the organization that advocates for the teaching of intelligent design, but as far as I can tell, doesn’t actually produce any science. Some of the other list members took the original poster to task with several rebuttals. Although I’m much less familiar with information theory than I am with actual evolutionary biology, I can’t justify finding the time to actually read through Dembksi’s book or the long rebuttals. I’m sure someone can point me to a more succinct discussion of the issues raised, so please do! I haven’t been convinced by an ID argument yet, but I still learn a lot about critical thinking from them.

When asked to summarize the point of the book, the original poster wrote:

As a science, intelligent design cannot identify ALL things designed, nor confirm with certainty that a particular thing is not designed. But, it does seek to identify SOME things that are designed. The argument to design is essentially an inference based on probabilities. As a result, there is a continuum ranging from the likelihood of non-design to the likelihood of design. At a certain point the probability of non-design nears zero and the probability of design nears one. At that point we can say with as much certainty as any other scientific fact that the thing in question was designed. It is in this area that the theory of intelligent design operates.

Criteria for detecting intelligent design are employed in SETI, cryptology, forensic science, etc. The claim is made that these criteria can also be applied to biological systems.

First of all, I’ve been completely unable to accept intelligent design as science. Science must make predictive hypotheses, devise ways to test these hypotheses, and incorporate all new data to modify these hypotheses. Science then produces fairly accurate models of how the universe works, and the ones that are so well supported by evidence as to be regarded as “the way stuff works” are designated “theories.” The very best that I’ve seen intelligent design do is provide very poor and whimsical alternatives to evolution and natural selection which may or may not apply within certain limited circumstances. For example, the flagella of bacteria are deemed “irreducibly complex” and machine-like. However, this, like many many other examples, has been thoroughly debunked. So, the writer of the quote above first of all misunderstands the definition of science by saying that ID may or may not apply to some circumstances. Secondly, he gives ID too much credit, since it hasn’t provided any proof of, evidence for, or serious predictions of intelligence in biological systems!

Next, in talking about probabilities, it is interesting to see how ID proponents assign probabilities to the “designedness” (my word, I’m cool like that) of biological functions and structures. My favorite arguments are that such complex structures, such as DNA, cannot arise from randomness. It’s so ridiculously mathematically improbable! With that, I agree. However, the process of evolution is not random, but guided and shaped by natural selection such that those few out of the many random mutations that benefit an individual propagate throughout the gene pool. And we see it in the lab AND in the fossil record AND right in front of our faces. The evidence is there whether you like it or not. Taking into account that we know that natural selection works and produces such a stunning array of biological specimens, well, the probability of design drops to nil. Unlike in the case of forensic science, where we have evidence of intelligent intent, there is no evidence of intelligent intent in biology. The evidence swings the other way, towards the “blind watchmaker” that IS natural selection.

I get generally annoyed at distortions of science and at blatant anti-science, like that which is spouted by so many IDers. Science is a laborious, winding, grueling process undertaken by legions of workaday scientists and students that do it for various reasons, but never for money or fame. (It’s not that we wouldn’t like it… it’s just not there!) And after slaving over data and simulations and results, their work then has to endure the skeptical shakedown of journal editors and academic audiences and then, finally, they can be assured that they have made some small contribution to science. Unless results are overturned by later evidence. This is serious stuff! So when a theory has undergone all of this for decades through various generations of scientists to finally be accepted as the best model to explain what we see in nature… that is when people with an ideological problem with the conclusions or implications of a theory come out and make all kinds of claims to try and topple well-established science. Is it so surprising, then, when scientists have little patience for such shenanigans? However, scientists still have a duty, in my opinion, to teach about the facts and evidence to the vast majority of people who haven’t made up their minds in ideological disgust.


You know your car wants one.

Categories: science
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Maybe I just need to buy my own hookah…

February 26, 2009 · 4 Comments

Virginia is ready to institute its own smoking ban in restaurants. Many non-smokers rejoice in this, but they don’t realize all the consequences to businesses. I’m personally not in favor of such bans, even though I don’t smoke cigarettes, since it forces the hand of business owners. But really, in the long run, most restaurants and bars manage just fine.

There are some establishments, however, where smoking is an integral part of the environment. Cigar shops and hookah bars make their living by providing havens for people to smoke. NBC highlights a few hookah bars in Virginia that are under threat from the ban. After reading that, I see no reason why cigar shops and hookah bars should not be exempt from the law, as was done in DC. Customers going to and employees working in such establishments know up front that they are in a place specifically meant for smoking. So the argument of “protecting the employees” is just silly.

I enjoy the occasional cigar and hookah, so I’ll be very sad to see this ban take place if the exemptions are not made. Charlottesville is seeing a rise in popularity of Middle Eastern dance, and some of the same venues that feature dance also offer hookahs. We’ll have the food, the tea, the music, the dancers… but no hookahs? That’s just a shame.


Buy me a pretty hookah and we’ll party at my place!

Categories: general
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First Stellar Images

February 25, 2009 · 2 Comments

Wait… what? First images of stars? But astrophotography goes way back. Let’s clarify.

Last week, astronomers unveiled the first images of stars using optical interferometry* (other than the sun) where the star is actually resolved. Even in the best astronomical images to date, every star other than the sun has been nothing more than a point of light on the detector with no discernible features. Astronomers using the Very Large Telescope Interferometer have released images of a double star in the Orion Nebula’s Trapezium and an expanding shell of gas around another star, T Leporis. I encourage you to check out the great coverage at Universe Today, Bad Astronomy, The Spacewriter’s Ramblings, and Simostronomy. But why is optical interferometry so important?

Resolution is an important concept in observational astronomy. Better resolution allows us to see finer detail in our. For example, you can change your screen resolution to see more or less detail on the display. Or, if you’ve ever driven on a long, flat desert highway, a car coming your way at night might seem to only have one headlight, until the point when the car is close enough that the headlight suddenly splits into two! That is the point at which the car is close enough that your eyes can resolve the two separate headlights. Resolution is determined by the wavelength of the light that you are observing and the size of the optical system you are using to measure it. In the headlight example, the wavelength is that of visible light, and the optical system is your eye. There is actually an equation that describes this: resolution = 1.22 * wavelength / diameter of telescope. You want your resolution to be small, so your telescope should be big!


Image from Nick Strobel’s Astronomy Notes. Go check out his lecture on resolution!

Single telescopes can only be built so big before they are mechanically unwieldy. Resolution was especially a problem for early radio astronomers, since the wavelengths are so long to begin with. The largest single-dish radio telescope is in fact built into a valley, that being the Arecibo Telescope in Puerto Rico. It’s not entirely unmovable, since the subreflector above the main dish can be moved around to point at different parts of the sky.


El Radio Telescopio

Radio astronomers built interferometers, or arrays of radio dishes that together act like one big telescope, in order to improve resolution. Although interferometers are less sensitive than if you actually had a telescope the full size, the resolution that they achieve can be stunning. Whereas ground-based optical telescopes have sub-arcsecond** resolution, and Hubble is quoted as having a resolution of 0.085 arcseconds, single-dish radio telescopes can only get resolutions of a few arcminutes. However, the Very Large Array in New Mexico can achieve resolutions down to 0.05 arcseconds. The Very Long Baseline Array, stretching from Hawaii to the Caribbean, regularly produces images with milli-arcsecond resolution. That’s like seeing my desk on the Moon.

Aperture synthesis is much more difficult, it turns out, for optical and infrared wavelengths than it is for radio. First, radio signals can be “mixed down” to frequencies that electronics and waveguides can easily transfer and manipulate. Optical signals, however, have to be transported as a beam of light with very little loss of information in the waveguides and beam combiner. By the time the interferometric fringes are measured, very few photons are left! Also, optical interferometers have to deal with atmospheric turbulence, just like their single-telescope counterparts.

Optical interferometry for astronomy was explored in the 1970s, and aperture synthesis was applied to optical wavelengths in the 1980s. Today, a number of telescope arrays are in use or being developed, such as the Naval Prototype Optical Interferometry, which I got to visit in 2004 and 2005, and the Magdalena Ridge Observatory. These, along with the two-element interferometers such as the Keck Observatory, contribute valuable observations and science such as astrometry, stellar diameters, binary star orbits, stellar accretion disks, stellar mass loss, sunspots on other stars, and more! However, most work so far has involved measuring the fringes, or the pattern of spatial frequencies that the interferometer actually measures, and making a model from that. This is valuable, and a fantastic achievement considering the technological hurdles that optical interferometers face. But, it is not the same as imaging.


Fringes measured, such as here, would be best fit by a model with two sources of light a certain distance apart and with a certain size. This result is similar to the results that an optical interferometer would produce.

Images released by the VLTI are being described as the first actual interferometric images of stars, not just models based on the fringes. They combined data from multiple runs of their four-element interferometer with the small telescopes in different positions in order to “synthesize” a telescope 100-meters across. The resulting images achieve resolution on the order of milli-arcseconds. We are entering an era when optical and infrared images with such fine resolution can be compared to similar images in the radio.

I will leave you with the fascinating images and some cool references on optical interferometry!


Click for more information on T Leporis! Image credit ESO/J.-B. Le Bouquin et al.


Click for more information on Theta1 Orionis C! Image credit ESO/S. Kraus et al.

* Phil Evans points out in the comments that Hubble has been able to resolve Betelgeuse! See, I’m just biased towards interferometers ;-)
** One arcsecond is 1/60th of an arcminute, and one arcminute is 1/60th of a degree. A degree on the sky can be approximated by the width of your index finger held out at arms length!

Interesting Links:
- 9th Imaging Synthesis Summer School, with
lectures on optical interferometry by Chris Haniff and
Michelle Creech-Eakman.
- (pdf) Optical Interferometry: A Brief Introduction by Markus Scholler
- Links to astronomical interferometers from Wikipedia

Categories: astronomy · science
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This made me giggle…

February 24, 2009 · Leave a Comment


From Pundit Kitchen

Thanks, Gail!

Categories: fun
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Beckoned by the Icy Moons… and CoS 91

February 21, 2009 · 2 Comments

So I’ve been called to task (thanks, WoodEngineer!) to cover some of the recent developments on the joint NASA/ESA proposed missions to the outer solar system. In the linked press releases, it is announced that the two space agencies will team up to explore some of the most tantalizing targets in the outer solar system: Europa, whose icy surfcace may be covering a rich, liquid water ocean, and Titan, home to liquid methane and a thick atmosphere. Europa will be explored by a team of two orbiters, along with its Jovian satellite siblings (Ganymede, Callisto, and Io) and Titan will be explored by an orbiter, and lander, and a research balloon. Whoa. We’re taking advantage of the thick atmosphere of Titan to send a research balloon which will pierce through the clouds and yet be safely above the putative methane oceans!

Europa, Titan, and the other “big shot” moons of the outer solar system may be dwarfed by their parent planets, but they are really worlds in their own right. In fact, if placed in the inner solar system, assuming they don’t lose their volatiles like ice, their sizes would not be too different from the inner planets, and they would fit right in as planets. In fact, Ganymede and Titan are larger than the planet Mercury! We, as water-based life forms, like to explore these worlds that may harbor water and maybe, tanatalizingly, life? Or, as in the case of Titan, not life, but a strange weather process involving not clouds and oceans of water, but of organic molecules.

You can find a lot more information on Europa in the well-timed Discovery Space Wide Angle feature which was released last week. Also, I have to second Dave Mosher’s nomination of the name Clarke for the Europa mission, although I had held out hope that could save that name for a Europa lander. I suppose that a more detailed study of Europa will be necessary before it is determined how far through Europa’s crust we can drill to find water. But still, a closer look is very exciting to me since I was also fascinated by Arthur C. Clarke’s exploration of Europa in 2010: Odyssey Two, and a mission to Europa was one thing that my astronomy professor from my undergraduate institution really wanted to see happen in his lifetime. We’re going to Europa, Doc E!

Lest I forget, the Carnival of Space #91 is up!

P.S. Whoops! Almost forgot… Ian O’Neill of Astroengine has interviewed Richard Greenberg, a scientist at the University of Arizona’s Lunar and Planetary Laboratory, about the possibilities of life in Europa’s subsurface oceans. The interview will be aired on Astroengine Live, which can be heard over the web at 7pm EST on Wednesday night. And if, like me, you have a bellydance class at that exact time, you can catch the archived shows on iTunes!

Categories: astronomy
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Not for the vegetarians/vegans…

February 19, 2009 · 4 Comments

My mind has been everywhere this week. You know how it goes. My blog should be as random as I am then, no? Or maybe I should just get dinner while my scripts are running…

CVille Skeptics tweeted this, and I found it uber-hilarious: The Bacon Flowchart

Click to see the full version.

And it reminded me of the meatiest, baconiest recipe ever, the Bacon Explosion.* Here is a teaser…

Check it out. That needs to be my contribution to the next astro-BBQ.

*Thanks, Tim!

Categories: fun
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New York's Hidden Museum

February 18, 2009 · 1 Comment

This came up about a week ago, in the midst of all the Darwin Day goodness, on Carl Zimmer’s The Loom. He and photographer Justine Cooper each got to take a tour of the hidden parts of the American Museum of Natural History. Long’s photograph’s can only be described as hauntingly beautiful, and I’m terribly jealous of Zimmer’s experience!

I have visited the wonderful AMNH several times since my first year of high school, and even applied for their astrophysics research program in college. (Sadly, I was turned down.) I love the Rose Center for Earth and Space, especially giving my own “tour” of it to friends and family, and dinosaurs are COOL, but in general I just love being exposed to the best science with the most interesting displays in fields with which I am not familar. Although biology didn’t interest me nearly as much as physics and astronomy for a career choice, I am endlessly fascinated by the complexity and interconnectedness of life on this planet. For the same reason, I’ve added all of Planet Earth to my Netflix list!

I would love to see the “other museum” one day. It is wonderful to know that right in the heart of New York City, scientists are working away to study and preserve the wonders of our planet and our universe, all while working for an institution that can effectively communicate these wonders to the public.

Categories: outreach · science
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Carnival of Space #90

February 17, 2009 · Leave a Comment

A lovely Carnival of Space was posted this weekend at 21st Century Waves. If you haven’t already, go catch up on all the astronomical goodness from the past week!

Categories: astronomy
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