Elon Musk says building the first sustainable city on Mars will take 1.000 Starships and 20 years
Musk's stated launch cost of only around $2 million per Starship flight is essentially required, should the final goal be to set up a "self-sustaining city on Mars"
The Ocean Cleanups latest invention collects 110.000 pounds of trash from rivers each day!
The Interceptor, which was unveiled in Rotterdam, Netherlands, in October, is a solar-powered trash-collecting barge.
Mars Society founder makes case for “Mars Direct” path to the Red planet
But what is the "Mars Direct" plan