Stephen Hawking warned: 'Humans have only 100 years left to leave Earth.'
physicist stephen hawking warns: people need to settle on another planet in the next 100 years if not to face the danger of extinction.
Tags : mars planet
Science test: Potatoes can be grown on Mars
research scientists have demonstrated that potatoes can grow in a simulated environment of radiation, temperature, air pressure, oxygen and the level of carbon dioxide similar to
