Roland M. Crocker

A vast hall with a thousand doors, and only one leads to the stars. The rest are locked, and the keys aren't just hidden: they're wrapped in other keys and tangled into a knot. That's the Great Filter in a new reading: not a chain of failures but a tangled hierarchy where each step depends on the previous one nonlinearly.

Two galaxies (our Milky Way and its satellite, the Large Magellanic Cloud) slowly circle each other. Their gravitational pull stirs the distant outskirts of the Milky Way, like a pebble thrown into a pond makes the water ripple.