Christian Davenportrimmed The Washington Post

When Elon Musk and his team at SpaceX were looking to make their Falcon 9 rocket even more powerful, they came up with a creative idea - keep the propellant at super-cold temperatures to shrink its size, allowing them to pack more of it into the tanks.

When Elon Musk and his team at SpaceX were looking to make their Falcon 9 rocket even more powerful, they came up with a creative idea - keep the propellant at super-cold temperatures to shrink its size, allowing them to pack more of it into the tanks.