Tag Archives: astronomy

Good questions from kids

I put a question to my 10 year old godson (in as much as an atheist can have a godson), and I’ll put the same question to all of you: what should Jeff and I talk about when we do … Continue reading

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Ask a Physicist: What does it take to discover an earth-like exoplanet?

In my latest column, I give an overview on how we search for exoplanets, how we’re just now at the point of finding new terrestrial planets, and why we might miss a second earth, even if it was practically right … Continue reading

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Podcasts from an honors student

It’s finals week here at Drexel, and things are very hectic. I wanted to share something fun with you, however. One of the students in my “Introductory Astrophysics” class wanted to do an extra project to get honors credit for … Continue reading

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What's the best map projection?

Next term, I’ll be teaching a course in general relativity, and while preparing my notes on the curvature of space, I was reminded of a really fun paper I worked on with Rich Gott a few years ago. As you … Continue reading

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MOND vs GR, round 2

As noted above, there used to be a huge chunk of a MOND-oriented debate here. However, I’m sure my typical reader isn’t looking for something anywhere that technical. If you are, check this out. -Dave

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Habitable? Not good enough. Inhabited.

David Charbonneau of Harvard gave an outstanding talk the other day at Penn on “The Fast Track to Finding an Inhabited Exoplanet.” While the title is (presumably intentionally) provocative, the science he described is amazing. A lot of attention has … Continue reading

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Oh Really? No. O'Reilly

I suspect most of you have heard the latest absurdities from Bill O’Reilly. Just to get you caught up, last month Bill O’Reilly tried to discredit atheism with the following argument: I’ll tell you why [religion is] not a scam, … Continue reading

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Universal Misconceptions #4: You don't expand

Okay, let’s tackle one more of these common misconceptions about the universe. The first three are here, here, and here. Today I’d like to dispel a few myths about local expansion. Put simply. while the universe expands on large scale: … Continue reading

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Universal Misconceptions #3: Redshifts

We’re talking, once again, about common questions and misconceptions about the expanding universe. If you haven’t already done so, take a look at my posts on the fact that time isn’t expanding and the fact the there’s no center to … Continue reading

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Universal Misconceptions #2: The Center of the Universe

In response to a flurry of emails prompted by my latest column, I decided to do a series of blog entries on common misconceptions about the expanding universe. Yesterday, I wrote about the expansion of time and how you can … Continue reading

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