Tag Archives: astronomy

Cosmological Distances

Yesterday, I posted a poll on our Facebook fan page asking what topic I should cover in this week’s Ask a Physicist. The winner is: The universe, as you’ve probably heard, is expanding. This has all sorts of cool implications … Continue reading

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Rittenhouse Astronomical Society Talk: "The Dark Side of the Universe"

Hi everybody, or everybody in Philly. This Wednesday, I’ll be giving a talk to the Rittenhouse Astronomical Society on “The Dark Side of the Universe.” Come learn about dark matter and dark energy, and (weather permitting) look through the scopes … Continue reading

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Mo' Stars = Less Dark Matter? Or none?

There’s been a fair amount of excitement over a paper by Van Dokkum and Conray (and subsequent popularizations) in which it was announced that elliptical galaxies seem to contain far more dwarf stars than originally supposed.  The upshot is that … Continue reading

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What can amateurs do? (In which I push the party line.)

A number of io9 readers have sent some interesting questions and started some good dialogs above and beyond simple physics questions. Richard Henretta (asker of one of my most popular AAP columns) raised an interesting question in the facebook fanpage: … Continue reading

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Sizing up the Universe

Let’s get the full disclosure out of the way early: Rich Gott is a friend of mine, he was a professor of mine in grad school, and I’m acknowledged in his book. You could be forgiven for thinking that I’m … Continue reading

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Full Impulse on my mark… engage!

There has been a ton of chatter on the interwebs about yet another potentially habitable planet in the Gliese 581 system, approximately 20.5 light years from earth.  This one, Gliese 581g, was discovered by the Lick-Carnegie Exoplanet Survey using Keck.  … Continue reading

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Come see me talking at you!

You know how on the internet you’re never quite sure whether HotGirl23 is really HotGirl23?  Likewise, how can you ever be sure that your friendly neighborhood physicist is really a physicist?  Or friendly?  Well, there’s one way to find out!  … Continue reading

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A1689 and Flexion

Warning! Technical. I wanted to alert you to a very nice paper that my former student, Adrienne Leonard (who has since gotten her Ph.D. at Cambridge and is now at Saclay), her former thesis adviser, Lindsay King, and I have … Continue reading

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Why do it?

I got an email from superfan Caden this morning, asking if I’d read the latest Dennis Overbye column on the premature announcement of earth-like planets from the Kepler Mission. The background, if you missed it, is that one of the … Continue reading

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Very cool map of the universe

Normally, I’m not one to simply repost the Astronomy Picture of the Day, but I couldn’t resist. The Museum of Natural History made a really cool movie (including planetary data, the SDSS galaxy and quasar sample, the Bright galaxy survey, … Continue reading

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