Gravitational waves are ripples in space from the mergers of black holes and neutron stars. Existing detectors, built with contributions from Kip Thorne and Rainer Weiss, work like highly sensitive microphones but only hear the highest 'notes'. Yet the main cosmic symphony plays at low frequencies — like the distant roar of the ocean surf.

A new type of gravitational-wave antenna will help capture this hum. It uses clouds of atoms cooled to near-total stillness. Like ripples on a pond from a tossed stone, these atoms form a wave pattern. A passing gravitational wave subtly changes the curvature of space, shifting the pattern — the device detects the displacement. The South Pole is an ideal listening post: the frozen ground doesn't tremble, and the research station provides power and communication. Combined with other observatories, it will pinpoint the exact direction of the source.

An amazing bonus: this antenna will not only detect stellar deaths but also primordial gravitational waves — echoes of the Big Bang in the fabric of space itself. So the silence of the icy continent will reveal the bass notes of the cosmos.