By MARISA HIRSCHFIELD, age 11
There are still no signs of life on Mars, but flowing saltwater has been discovered. NASA’s Reconnaissance Orbiter spacecraft has spotted dark streaks on Mars, which turned out to be saltwater trickling down slopes. NASA’s scientists are now hoping to find traces of life on the red planet. Michael Meyer, a lead scientist at NASA, is planning to launch a rocket to collect samples of rocks and soil in 2020.