The size of the observable universe is complicated.

The radius of the observable universe is often stated to be 46 billion light years.  From a certain point of view, this is true, but I think it's a bit of a misleading statement.  Occasionally you also see people say that the observable universe is 13.8 billion light years in radius, which is also true, from … Continue reading The size of the observable universe is complicated.

When Will We Build the Starship Enterprise? | Seth Shostak

What if we could send humans anywhere at the speed of light, and at a rock-bottom price? That's eminently feasible if we send the information and not the protoplasm. No crew, just code. Consider: The human genome consists of about 3.3 billion base pairs. Since there are only four types of pair, that amounts to … Continue reading When Will We Build the Starship Enterprise? | Seth Shostak

Why FTL travel is unlikely, at least in the foreseeable future

I'm a big fan of Star Wars, Star Trek, and the space opera genre.  The future I would most hope for the human race would be for us to spread out among the stars and become an interstellar species.  Now, assuming we don't drive ourselves extinct, I do think we will eventually become an interstellar … Continue reading Why FTL travel is unlikely, at least in the foreseeable future