How to Hunt for Distant Worlds

Since the discovery of the first planet orbiting a Sun-like star in 1995, more than 4,000 exoplanets have been found. These widespread planetary systems confirm that our solar system is just one of many in our Milky Way galaxy. The discovery of such systems provided intriguing insights, challenging our perspectives about how planetary systems form and evolve. But how do astronomers search for these exoplanets and what can we find out about them?

Join Dr. Emily Rickman of the European Space Agency and Space Telescope Science Institute as she describes the scientific hunt for these distant worlds.

This is an excellent lecture. Looking at Galileo and his first telescope (which the lecture does acknowledge, was a modification of an eye piece from the time). First exoplanet discovered in 1992, and since then the has been many more. Looks at different ways we can find exoplanets and touches on how we can now determine what makes up the atmospheric composition.