Tag Archives: technical

I get email: Do FTL signals let you communicate back in time?

First and foremost, let me go on the record, once again, and say that I think that the faster than light neutrino result is almost certainly flawed. I’m not going to debate the point, since I’ve already made a number … Continue reading

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Could photons have mass?

In response to my column the other day about whether or not neutrinos could travel faster than light, several of you raised the possibility that: It could simply mean that neutrinos have less mass than photons, so that the true … Continue reading

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Maps again (and a few announcements)

I’ve been a little lax with the blogging lately. I’m sure you’ll forgive me. Before getting to the main topic, I have a couple of quick announcements: I have an column coming out Wednesday or Thursday this week. I’ll be … Continue reading

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I get tweets: How close can you get to the speed of light?

As I hope you know by now, I’m on twitter, and you should totally follow me. While it’s not always a great idea to ask physics questions in tweets (as 140 character answers are unlikely to be informative), a follower … Continue reading

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Which casino games are the worst, and why

Those of you who know me personally may recall that back in the day, I was a pretty solid card player. Mostly blackjack, but I played around a bit (successfully in theory, not so much in practice) with poker. At … 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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I get email: Time and Gravity

Every now and again, I like to share fun questions that aren’t right for the column, but which you guys might find interesting. For example, check out this, this, or this. As I’ve done in the past, I’m going to … Continue reading

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How long do you have to rescue someone from a black hole?

Forever, and if you hold tight for a bit, I’ll explain why. I’ve been teaching a grad course in general relativity this term, and I’ve been having the time of my life. While my own work in gravitational lensing uses … 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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