We’re Still Waiting for Hollywood to Depict a Plausible Alien Ecosystem - Facts So Romantic

You might expect scientists to heap scorn on Hollywood’s depiction of aliens, but they’re generally forgiving. Dirk Schulze-Makuch, an astrobiologist at the Technical University of Berlin, remarks that most science-fiction aliens are either riffs off the weird life we see in Earth’s deep ocean, such as the squid-like creatures of Arrival, or versions of now-extinct animals from earlier in our planet’s history, such as the adult trilobite in Prometheus. And that’s not a bad strategy.

“If you want to study a lot of different body shapes or forms, look at the Cambrian Explosion,” he says. “If you look at a museum exhibit of life from 500 million years ago, you see trilobites and other unique types of life. There’s a lot of variety.”

What irritates him and others isn’t what movie aliens look like, but the magical things they do. Leave aside their physics-defying technology and consider just their most basic attributes, such as metabolism. “Prometheus was especially terrible this way,” says Caleb Scharf, the director of astrobiology at Columbia University. “[That movie had] the idea that a little thing can grow into an enormous thing when you’re not looking, even though there’s nothing to eat. They left this thing alone, and the next…
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