These people “went to Mars” and came back. Who are they? Where did they actually go?

Cracked by: Urthstripe, Anjul, jowens, shrik, meenakshi, Manish Achuth, Rogi, KK, raklodramA, Shwetha Maiya, shivathilak, badideabear, Sumanth Patlolla, Sanjeet Dash, Rahulk, Bipin Banavalikar, finkle, Bharath, Prabhu DC, Thejas V R, Ananth, Aditya S, Siddarth Pai, thiru d gr8, Subhrajeet C, Sri Krishna, Amarendra Kumar and rickde