The former US President Barack Obama hit out at Silicon Valley tycoons' aspirations to colonize Mars.

Earth would be more liveable than Mars "even after a nuclear war" and climate change, he said on Friday.

Obama said that even if climate change or nuclear war occurs, Earth will be far more habitable than Mars. So instead of spending so much money to go to Mars, that money should be invested for Earth.

It comes as Elon Musk and Jeff Bezos test mega-rockets that could take humans to the red planet. However, Obama asked them to think about the earth first before colonizing to other planets.

Bd-pratidin English/Lutful Hoque