Cristina has been waiting to ask this one since season one after pondering Kepler’s laws of planetary motion. What is a gravitational assist and how does it work? If you have feedback or a topic suggestion, email us. Image credit: NASA
This episode’s question is: we understand that gravitational lensing is one of the predictions of Einstein’s theory of general relativity but what is it? If you have feedback or a topic suggestion you can email us.