Can we detect cosmic dawn's 21-cm whisper from space?

The global 21-cm signal from cosmic dawn—when the first stars formed—is drowned out by terrestrial FM radio. Researchers simulated whether a radiometer in low Earth orbit could escape this noise and detect the signal instead. They find that a polar orbit at the right altitude works: most plausible cosmic dawn signals could be recovered with high confidence, making space-based detection feasible where ground telescopes fail.