Tag Archives: cosmology

I get mail: Dark Energy, The Expanding Universe, and Noether’s Theorem

You know I love getting mail. I like getting questions, brain-teasers, compliments, or in rare cases, all three. Not every question is right for my “Ask a Physicist” column over at io9, either because it’s a bit too specific or … Continue reading

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Ask a Physicist: A Practical Guide to Intergalactic Travel

Good news everyone! I have a new column on io9: How to Make it to the Edge of the Observable Universe in a Few Decades. This is one of the most fun columns I’ve written in ages, so please do … Continue reading

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Travel to the end of the Universe

About a week ago, I had a contest on io9 calling for questions about the universe. I got one that seems, on first blush, to be kind of silly, but on further inspection is kind of awesome. Cameron asks: What … Continue reading

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Some awesome stuff (that I didn't do)

We are just finishing up the Winter term here at Drexel. This term, I’ve been teaching an advanced undergraduate/graduate course in cosmology. One of my undergraduate students, Mary Chessey, wanted to do an additional honors elective. She developed a series … Continue reading

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I get email: and then assign it to my students

I’m teaching an advanced undergraduate/graduate course in cosmology this term, and I thought it might be fun to combine the education and outreach sides of my life. I get sent a lot of interesting questions, and answering them have prompted … Continue reading

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Ask a Physicist: What happened before the Big Bang?

Credit: J.R. Gott & L.-X. Li Greetings, true believers! My latest column is up at io9: What Happened Before the Big Bang? This one is a) extremely speculative, and b) largely excerpted from the “User’s Guide.” Of course, if you’d … Continue reading

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What is the biggest problem in physics?

I like to be reasonably forthcoming both here and in my “Ask a Physicist” columns at io9 about what we do and don’t know about the world. As successful as physics (and in particular, the idea of symmetry) has been … Continue reading

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A few thoughts on the 2011 Nobel Prize in Physics

The winners of 2011 Nobel prize in Physics have been announced. “For the discovery of the accelerating expansion of the Universe through observations of distant supernovae” one half does to Saul Perlmutter of the Supernova Cosmology Project and the other … Continue reading

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Tomorrow's Column: The Shape of the Universe

Tomorrow in io9 I’ll be answering a question about the shape of the universe: What’s up with the concept of “shape” applied to the universe? How can something with no practical boundaries have a shape? I couldn’t, in good conscience, … Continue reading

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Dark Matter – Livetweeting

Hello everyone, and greetings from not so sunny Baltimore. I’m down here to attend the Space Telescope Symposium on Dark Matter. I thought it would be fun to livetweet the conference, so if you’re not already following me on twitter, … Continue reading

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