Tag Archives: Space

Apollo 11 and the lost space age

I was very young when Neil Armstrong and Buzz Aldrin landed on the moon in 1969, so I have no memory of the landing, and only limited memory of the Apollo program in general.  I think I remember seeing some … Continue reading

Posted in Space | Tagged , , , , | 42 Comments

Is cosmology in crisis?

In past posts, when I’ve written about the expansion of the universe, I’ve generally referred to the rate of that expansion, the Hubble constant, as being around 70 km/s/megaparsec, that is, for every megaparsec a galaxy is distant from us, … Continue reading

Posted in Zeitgeist | Tagged , , , , , , | 23 Comments

The real issues with colonizing space

At Nautilus, Phil Torres argues that we should think twice about colonizing space.  His reasoning appears to be that as we spread throughout the universe, we will undoubtedly diversify into different species, and that those species may come to distrust … Continue reading

Posted in Zeitgeist | Tagged , , | 24 Comments

What’s at the edge of the universe?

Gizmodo has an interesting article that someone asked my thoughts on.  Part of their “Giz asks” series, it asks various physicists what’s at the edge of the universe?  The physicists polled include Sean Carroll, Jo Dunkley, Jessie Shelton, Michael Troxel, … Continue reading

Posted in Space | Tagged , , , , , | 29 Comments

Why faster than light travel is inevitably also time travel

I’ve always loved space opera, but when I was growing up, as I learned more about science, I discovered that a lot of the tropes in space opera are problematic.  Space operas, to tell adventure stories among the stars, often … Continue reading

Posted in Science Fiction, Space | Tagged , , , , , , | 171 Comments

Dark energy and repulsive gravity

Over the weekend, Sean Carroll put up a blog post to address common misconceptions about cosmology.  I understood most of his points, but was confused when I saw this one: Dark energy is not a new force; it’s a new substance. … Continue reading

Posted in Zeitgeist | Tagged , , , , | 23 Comments

The difficulty of going to Mars

There’s been a lot of celebration this holiday season of the fiftieth anniversary of the Apollo 8 mission, the first time humans went into (relatively) deep space and orbited another body, the moon.  I’m glad to see Apollo 8 getting … Continue reading

Posted in Space | Tagged , , , , | 23 Comments

SETI vs the possibility of interstellar exploration

Science News has a short article discussing a calculation someone has done showing how small the volume of space examined by SETI (Search for Extraterrestrial Intelligence) is relative the overall size of the galaxy. With no luck so far in … Continue reading

Posted in Space | Tagged , , , , , , | 19 Comments

The extraordinary low probability of intelligent life

Marc Defant gave a TEDx talk on the improbable events that had to happen in our planet’s history for us to eventually evolve, along with the implications for other intelligent life in the galaxy. I find a lot to agree … Continue reading

Posted in Space | Tagged , , , , , , , | 25 Comments

The difficulty of interstellar travel for humans

Futurism.com has an article reviewing the results of a survey they conducted with their readers asking when the first human might leave the solar system.  The leading answer was after the year 2100, which make sense given our current level … Continue reading

Posted in Space | Tagged , , , | 25 Comments