Researchers explain in a study how astronaut blood can be used as a binder, along with extraterrestrial dust, to create cosmic concrete that could serve as building material for Martian colonies

New Delhi: Space giants are aiming to send the first humans to Mars. Building a Martian colony up there is also not a far-fetched reality any more — only, it's far too expensive.   

Carrying a single brick would reportedly result in an expenditure of US $2 million.