Getting to Mars with current rocket technology will use massive amounts of fuel to move very small cargoes. There is a more fuel-efficient way.
Building a tiny starship may be doable. The big challenge will be making sure it survives all the hazards in interstellar space.
Yes, it really is rocket science.
We're on the cusp of being able to consistently launch and land rockets, greatly reducing the cost of space travel. But how long before there's a Millennium Falcon in every garage?
What does it feel like to prepare for a journey to space? Space scientist Monica Grady followed astronaut Tim Peake around for a few days before his launch to find out.
Spaceplanes seem like a great idea – perhaps one that has come too late.
Cheap, affordable space travel would be revolutionary. Chances are, when it comes, it won't rely on the brute force approach of rockets.