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Is of a mood to let space x handle that research and development? >> but this is a significant to build this class of engine. it will take a billion dollars in five years. congress can drive that cost down, but this is an investment in national security. in five years, we would be out from under the russian monopoly. and it should be on american engines. >> thank you very much. tom jones, former nasa astronaut and planetary scientist. >> new information on the terrorist attack in san bernardino. fbi director comey said there is no evidence that the couple were part of a real terrorist cell. he...

As far as believing there could be life out there somewhere. tom jones, planetary scientist and former nasa astronaut joining us, author of planetology. let's get basic. why does methane matter in all of this? >> methane on earth is produced from bacteria to cows and we find it everywhere on earth in great quantity. it's one of the big green house gases in our atmosphere. when scientists looked at mars on telescopes and found traces of methane and that was backed up by a european trip around mars, they thought we might find a god marker on mars. curiosity was following up on this measurement. ...