Po Bronson

Hundreds of inexpensively made antennae tuned into the cosmos look for radio waves from potentially habitable planets at Caltech’s Owens Valley Radio Observatory near Big Pine, California.

The Planet Hunting Machine

Caltech professor Gregg Hallinan and his team are scanning the universe for possible Earths with cheap antennae built from parts found online, cake pans, and, yes, chicken wire—taking the lonely search for habitable planets and automating it.

Planet has built the world’s largest constellation of satellites. The company has deployed more than 300 Dove satellites; about 140 are active.

A Dove’s Eye View

Planet has about 140 shoebox-size satellites that take 1.2 million pictures a day. They’ve spotted North Korea’s nuclear tests, the massacre of Muslim Rohingya, and California forest fires — images that are changing how we look at ...