It started out as conversation about how Edge of Tomorrow is the best big screen SF movie to come along in a good long while. That led to a ranking of recent SF movies with very high marks going to Elysium and Ender’s Game. It also touched on that Tom Cruise has made four — no, five! — SF films, at least two of which are very good.
Of course that led to talk of actors and how Jodie Foster and Matt Damon seem (unlike, for example, poor Sandra Bullock) to have excellent taste in what scripts they accept. If either of those two — let alone both — is in a movie, it’s probably pretty decent. Talk of actors in SF films naturally lead to Keanu Reeves whose ancestry and acting style make him such a perfect choice in certain roles.
And that lead to what a damn shame it is they tried to remake The Day the Earth Stood Still.
The Earth orbits our star, Sol, at a distance of roughly 93 million miles (150 million kilometers) — a distance we call an Astronomical Unit (AU). Our little rock is just under 8,000 miles wide (a bit over 12,000 km) and has a surface area (including oceans) of just under 200 million sq miles (510 million sq km). Depending on how you look at it, the Earth seems very large or very small.
What if, instead of a rock spinning around its star, it was a ring encircling it? Suppose the ring spun fast enough (770 miles per second) to create “gravity” on its inner surface? And suppose the ring was one-million miles wide and had walls 1000 miles high long both rims to keep air inside? Such a ring would have a surface area equal to about three-million Earths.
And what you’d have is Larry Niven’s Ringworld!