Beyond Light

Applying the same idea to other stars — measuring their tiny brightness oscillations to determine their internal structure, mass, radius, and age. Space photometry from Kepler and TESS turned it into a precision tool.

Gravity bends light, so massive foreground objects magnify and distort background ones — strongly, into arcs and multiple images, or weakly, subtly shearing distant galaxies. Lensing weighs matter directly, mapping dark matter that emits no light.

Detecting the minute stretching and squeezing of space as gravitational waves pass, using kilometre-scale laser interferometers. Since 2015, detectors have heard the mergers of black holes and neutron stars, opening a new sense for astronomy.

Reading the Sun's interior from the oscillations that ripple across its surface, as seismologists read the Earth from earthquakes. Helioseismology has mapped the Sun's internal rotation and the depth of its convection zone.

Combining light, gravitational waves, neutrinos, and cosmic rays from the same event to learn what no single messenger could tell. The 2017 neutron-star merger, seen in gravitational waves and across the spectrum, was its landmark.

Catching the ghostly neutrinos that stream from the Sun, from supernovae, and from the most energetic events in the universe. Neutrinos pass through matter almost untouched, carrying information from places light cannot escape.

Watching a star wink out as a foreground body passes in front of it. The timing reveals the size and shape of asteroids, the rings of the giant planets, and the atmospheres of distant worlds — even Pluto's.