The New Horizons mission revealed Pluto's jaw-dropping vistas and geophysical mysteries. One listener wanted to know why the spacecraft didn't go into orbit around Pluto. Tom Spilker, interplanetary travel expert, tells us the answer.
Tom made some slides to accompany this podcast! You can download them here:
Dr Paddack, one of the discoverers of the YORP effect, tells some funny stories from his time at NASA. Here he shows an element from his famous experiment; a simplified spacecraft model with uniform color. When placed in a vacuum attached to a friction-less bearing, this element started spinning when a light was shone on it.