Happy Saint Patrick’s Day!
We discussed how planets are detected. Gravitational detection (as for Pluto), astrometry – redshift/blueshift of a star as its planets pull on it, and transit detection. We talked about the Kepler mission. We watched 20 minutes of Armageddon and made fun of it, and we watched NASA’s Deep Impact mission crash into a real comet as well as some videos of astronauts falling down on the Moon.