Our Sun could erupt at any moment, spewing a vast wave of charged particles toward Earth that could leave millions of people without power for up to a year.
Using Einstein's elaborate theories, Jim Al-Khalili looks at whether the rate humans age is affected by gravity and the speed at which the Earth moves.
The journey to the neighboring planet traces a path connecting Nikola Tesla, Nazi weapons of war, a Cold War space race, and a string of blockbuster discoveries made by some of NASA's most talented robots.