NASA's Curiosity rover - a mission that has spotted evidence of liquid water as well as potential signs life and habitability on Mars - has completed six years on the red planet.<br /><br />Visit Outlookindia for more news: https://www.outlookindia.com<br /><br />Follow Outlook here:<br /><br />https://www.facebook.com/Outlookindia<br />https://www.twitter.com/Outlookindia<br />https://www.instagram.com/Outlookindia
