Astronomy
Exoplanet Detection via Transit Photometry and Radial Velocity
Quick fact
Most of the first exoplanets found were discovered by the radial velocity method, but the transit method has now found thousands—thanks to missions like Kepler—revealing that planets are common around other stars.
Why this is interesting
When you look at the night sky, the stars seem fixed—but some are actually moving, and a few even blink. How can we tell if that subtle dance is caused by an invisible planet?