Tag Archives: email

Does it make sense?

A question from a reader: My dad always told me, after finishing a math problem for homework, ‘look at the answer and ask your self ‘does this answer make sense’” So, my question is: do the answers we get from … Continue reading

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I get email: WHY (not how) does speed and mass affect time?

Credit: Herb Thornby As you may know, I’m teaching a General Relativity course this term, and so I have spacetime on the brain. So it’s particularly fun when I get relativity-oriented emails. This morning, for instance, I found a question … Continue reading

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I get mail: Does a box of photons have mass?

Lately, my my inbox hath overflowed. Yesterday, I got a thought-provoking email from a fellow physics instructor. It’s a good, non-intuitive question about special relativitiy. It’s also got the “technical” tag, so if you’re afraid of a few equations and … Continue reading

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I get mail: Why are maps of the universe drawn as ellipses?

You’ve almost certainly seen all-sky maps like the Planck CMB map, above. To those of us in the biz, it may seem obvious what it is we’re looking at, but that’s only because we’re overly familiar. It’s worth reminding ourselves … Continue reading

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I get email: How could everything be packed into an infinitesmal universe?

A few days ago, I posted my first io9 column in quite a while, and it seems like there was substantial pent-up demand to ask a real, live physicist questions about the universe. I apologize for my neglect. While the … Continue reading

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I get mail: Twin Paradox Edition

Greetings, true believers! Apologies for the relative infrequency in posting, but as most of you know, I’ve been working hard on my upcoming book. I’m over the hump, and sent the first half to my editor a couple of weeks … Continue reading

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I get email: Could we spot the enterprise?

Every now and again, I get a fun question that is totally in appropriate for the column, in that in order to answer it, I need to throw out a few equations. Last week, I got an intensely nerdy email … Continue reading

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I get email: Why doesn't a black hole get infinitely massive?

Greetings, relativists. I got an email from a former high school science teacher named Jeffrey that I thought would be fun to do here, rather than in the column. This is a fair bit more mathematical than even my normal … Continue reading

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I get email: Dark Energy and Universal Expansion

Some time ago, I wrote a 4-part tutorial on common misconceptions about the expanding universe: Part 1, Part 2, Part 3, Part 4. Following my latest cosmologically oriented io9 column, I got a an interesting query from a reader about … Continue reading

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A spoonful of neutron star makes your spaceship explode

Note: This one has a “technical” tag, which means equations lay ahead! I got a fun email today, and while it’s probably not quite right for my Ask a Physicist column, it’s actually a lot of fun to go through … Continue reading

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