michelle: ashwin is it possible we might get samples back from mars? ashwin: we hope. so one thing we're working on is a mission called the mars 2020 rover. it has some really sophisticated instruments it's bringing with it to mars to do these investigations to look directly for signs of life but it also is proposed to bring samples back to earth one day. it requires a few follow-on missions to do that. something to land a rocket on mars, and then to gather those samples from where 2020 has left them on the surface, to bring them back to the rocket and blast off from mars and hen to rendezvous with the space we've put in mars orbit and bring it back to earth. that's a lot of cool technology j.b.l. has to invent. michelle: we are planning to return to mars, one of the things we're trying to do is figure out where the best places to land next would be. there are some questions here about how are we determining the best places to, where to explore next on mars. jen: one of the big questions is where else are we going to find organic carbon? there are various environments

ess since we are at jpl another one to ashwin. we have a question if you could add one more tool to the rover, what would it have been? what was the thing you wanted the rover to have that you don't happen to have. >> that's a tough one. there's probably a list of things -- i am going deflect and say the next thing we want to do on mars is exactly what we are doing with the mars 2020 mission. building on all the results from habitability and organics and possibility of life that curiosity has opened up and looking ahead to having instruments on mars that are built to look for those signs of life. >> so jen this is is a good one for an astro biologist. that is difficult question. you have on beganic molecules what signs do you look for that might hint they are base on life. >> all life is based on organic molecules. we know that's not the only way to make them. if we are going to look for life the f thing to do is look for signatures associated with organic materials. a that w part of the reason it was significant when we found org

another flow of modern ashwin the guatemala has forced emergency teams to abandon the search for survivors a week after it first erupted killing at least one hundred ten people. the battle for control of a besieged city in eastern libya is intensifying downer is the last eastern city not held by forces loyal to renegade general hurley for have to his troops are bombarding the coastal city from the east and west using machine guns and heavy artillery trying to oust armed groups some linked to al qaeda which are controlled and are for years the u.n. says it's worried about the safety of an estimated one hundred fifty thousand civilians living there. people are fleeing down there in greater numbers than at any time since heavy fighting began two months ago three hundred families who feared revenge attacks if the city falls to have to us forces have been rescued by red crescent volunteers aid groups appealing for safe corridors to be set up to move others to safety but would have to head has more from the capital tripoli. the situation in the libyan eastern city of there is going from bad to w