To accompany “Rogue planets wander the galaxy all alone”
1. How do planets form? What force keeps planets orbiting their stars?
2. How do planets differ from asteroids and comets?
1. How many planets without stars have astronomers found over the past 20 years?
2. What might be some reasons orphan planets no longer orbit a star?
3. What is the official definition of a planet, according to the International Astronomical Union?
4. What’s the difference between an orphaned planet and an asteroid or comet?
5. What is the difference between an orphan planet and a star?
6. How do scientists detect most planets outside our solar system?
7. What is gravitational lensing?
8 In what country is the Optical Gravitational Lensing Experiment (OGLE) located?
9. Who is Nancy Grace Roman and why is she important?
1. Use your imagination and describe what the environment would be like on an orphan planet if you were to travel to one.
2. Explain why a space-based telescope can yield more information than a telescope on Earth.