Dr James Green, current Chief Scientist of NASA gives a talk on the how life may be distributed on Earth and in the Solar System with consideration of the age of our sun. This talk was a joint lecture held by the The Department of Physics and the Worshipful Company of Scientific Instrument Makers. NASA's Gravity Assist podcast, hosted by Dr. James Green: https://www.nasa.gov/mediacast/gravity-assist-explorer-1-jim-green-s-gravity-assist