In a special two part episode, Fraser collaborates with space historian Amy Shira Teitel at Vintage Space to investigate what spaceflight advances could have happened. Amy looks at the lost Apollo Missions, while Fraser talks about Werhner Von Braun’s “Mars Project”.

We know there’s dark matter, and there are galaxies, but are there galaxies entirely made up of dark matter? Astronomer Sarah Pearson joins Fraser to talk about what’s out there.

The stars look static in the sky, but are they moving? How fast, and how do we know? What events can make them move faster, and how can humans make them move?

In this week's QA, Fraser contemplates the horror of advertising in space, setting off nukes to counteract global warming, and what it would be like to go skydiving on Mars.

In this QA, Fraser wonders how Earth would react if aliens colonized Mars, is it ethical to seed Enceladus with life, and if the total mass of the Universe has changed.

In this week's QA, Fraser suggests some good locations for a Mass Driver launcher, how the laws of physics would be different in a different universe, and what it would take to throw a supermassive black hole out of its galaxy.