Professor Cristina Thomas talks about NASA's first planetary defense mission: DART. DART is a spacecraft that will impact a tiny asteroid moon. She explains why ground-based telescope observations are key to the mission's success.
Dr. Matthew Knight tells us about a discovery that excited astronomers all around the world. 'Oumuamua is the first minor planet from outside our solar system that we have found. Dr. Knight describes what it was like to observe this speedy object, and explains how it compares to local asteroids and comets.