A medical engineer and an astronaut work together to survive after an accident leaves them adrift in space.

So what’s not to like?

You knew there was a “but” coming, right? Unfortunately, with all this verisimilitude, there is a hole in the plot: a gaping orbital impossibility big enough to drive the Starship Enterprise through.

After they stop tumbling and find the shuttle destroyed and their colleagues all dead, Mr. Clooney tells Ms. Bullock that their only hope for rescue is to use his jetpack to travel to the space station, seen as a glowing light over the horizon. “It’s a long hike, but we can make it,” he says.

At this point, space fans will groan.

As we recall from bitter memory, the Hubble and the space station are in vastly different orbits. Getting from one to the other requires so much energy that not even space shuttles had enough fuel to do it. The telescope is 353 miles high, in an orbit that keeps it near the Equator; the space station is about 100 miles lower, in an orbit that takes it far north, over Russia.