You want to build a spaceship that can travel from Earth to the newly established colony on Mars, but there's no way a human crew can survive the trip.
Touch the inside surface of a window on a cold day and you can see that glass is bad at keeping out cold. Why does glass work so well for building hothouses?
How will future space explorers protect themselves against dangerous solar flares?
The sun may be far away, but its solar flares still present a deadly risk for astronauts going to the moon.
What happens as you and your bag pass through an airport security gate?