Let's Get Off This Rock Already!
An Author's Adventures in Space Travel, Science Fiction, and Worlds Beyond
Avi Loeb believes aliens are real, and they've visited our Solar System. But this man is no fringe conspiracy theorist, dressed in ratty flannels and a tinfoil hat, broadcasting rants from a pirate radio station in the wilderness—he's a Harvard University professor, who has done world-renowned research on cosmology and astrophysics. This is a serious... Continue Reading →
Back in February I handed down the definitive ranking of all the planets in our Solar System. Today, I'm going to finish the job with a corresponding ranking of the Solar System's moons—rich and varied worlds in their own right, some larger than the smallest planets. This will not be an exhaustive list. Jupiter alone... Continue Reading →
An astronomy pop quiz for you: How large does a planet have to be before it can have a natural satellite of its own? It's a trick question, you see. There's no lower limit. In fact, moons aren't just the province of planetary-mass bodies like Jupiter, Pluto, and our own Planet Earth---asteroids have them, too.... Continue Reading →
Not all the worlds in our solar system are created equal. Some are enormous, some are vanishingly small; some are scorching hot, others freezing cold; some (one) are clement to human life, while some (all the rest) are inhospitable deathtraps. And if I may be frank---some are just better than others. For today's post, we... Continue Reading →
The absolute smallest angular distance resolvable by the human eye is 28 arc-seconds1. That's about 0.008 degrees, or the apparent size of a quarter at 132 meters, and for those of us not blessed with impeccable vision, that value will be a lot worse. Thankfully modern technology far surpasses the limits of human eyesight, seeing... Continue Reading →
Below is a list of the known stars1 and stellar systems within a ten-light-year radius of the Sun. See if you can notice anything strange about them: Alpha Centauri (A and B, plus Proxima Centauri). Barnard's Star. Wolf 359. Lalande 21185. Sirius (A and B). Luyten 726-8 (A and B). Ross 154. There are familiar,... Continue Reading →
Today's post will be a tad unusual---a personal essay about a fond memory, not unlike my Star Trek piece from a while back. Enjoy! For all that I've been enthralled since childhood by the mysteries of deep space, reverent of humanity's forays beyond this rock we call home, I went through most of my life... Continue Reading →
The first and only time I ever saw the Grand Canyon was when I was eight years old, traveling through the southwestern United States on a family road trip. I knew roughly what it looked like, of course, but nothing had prepared me for the sheer scale of that thing. It was a sculpted, dizzyingly... Continue Reading →
Wherever you see an alien planet in sci-fi films or television, there's always something weird going on in the sky. How else would you know you're not looking at Earth? So in everything from Avatar to Star Wars we get double stars, panoplies of moons, other planets in the same system---so many disks visible even... Continue Reading →
I originally had another topic planned for today---it was written and scheduled, and of course I will still upload it at some point---but then my area had a rare winter storm, blanketing everything in ice and snow, and I thought to myself that it would be appropriate to do a blog post on Europa, one... Continue Reading →
