KENNEDY SPACE CENTER, Fla. NASAs $2 billion upcoming mission to Mars is the space agencys most complex ever to the red planet. NASA built its Mars 2020 rover in California and it arrived in February at Kennedy Space Center ahead of a summer launch. Last month, NASA scientists installed the rovers sample collection tubes. "One day when we send humans to Mars, we're gonna know where to go to get the absolute best science and data we can get," NASA Administrator Jim Bridenstine said. "We're very excited about Mars Perseverance and it's a great time to be at NASA and I hope it's a great time for everybody to watch the stunning things that NASA is capable of doing," Bridenstine said.