Discuss each question with your team. Be prepared to explain the reasoning behind your team's answers after the quiz.

1. How recently did astronomers begin to discover planets around stars outside our solar system?
   • Within the last thirty years
   • The mid 1900s
   • The mid 1800s
   • The mid 1700s
2. Which of the following is not a method used by astronomers to find exoplanets?
   • Directly imaging the planets using telescopes
   • Measuring the Doppler shift of the star to detect small 'wobbles' caused by orbiting planets
   • Measuring changes in the intensity of the starlight caused by transiting planets
   • Using radio waves to 'ping' extrasolar planets like a ship's sonar
3. Roughly how many exoplanets have astronomers discovered so far?
   • 50
   • 500
   • 5000
   • 50,000
4. Which of these strange types of objects have astronomers discovered outside of our solar system?
   • Large gas giants with orbits very close to their star called 'hot Jupiters'
   • Planets in orbit around stellar remnants like neutron stars and pulsars
   • Massive terrestrial planets called 'super Earths'
   • Free-floating planets that drift through interstellar space
   • All of the above