In 1995 Michel Mayor and Didier Queloz caught a Sun-like star, 51 Pegasi, wobbling every 4.2 days — a Jupiter-mass world whipping around in a scorching orbit. It was the first planet found circling another Sun.
Two instruments read one star. The transit dip gives the planet's radius (dF/F = (R_planet / R_star)²); the velocity wobble gives its mass (only M·sin i, the minimum). Together they give its density — rock or gas.
A transit needs a rare edge-on alignment: the odds are only about R_star / a, so wide orbits almost never line up. Both methods also shout loudest for big, close-in worlds.
That shared bias is why the first exoplanets were hot Jupiters. Later, staring missions like Kepler and TESS folded thousands of orbits together to pull small planets out of the noise — the trick you can try here.
Something in the simulation stopped unexpectedly — the lesson continues without it. You can move on; nothing you did was wrong.