Rocket scientists agree that we have about reached the limit of our ability to travel in space using chemical rockets. To achieve anything near the speed of light we will need a new energy source and a new propellant. Nuclear fission is not an option.
-- Wilson Greatbatch
   
Wilson Greatbatch   Name:
Wilson Greatbatch
Type:
Inventor
Nationality:
none
https://www.nutquote.com/quote/Wilson_Greatbatch