NASA's portfolio of scientific exploration includes a broad and robust array of missions and destinations. The James Webb Space Telescope — scheduled to launch in October 2018 — will orbit the Sun a million miles from Earth and will reveal new worlds, galaxies and solar systems, enabling a better understanding of our own place in the universe. The 2020s will bring a new rover to the surface of Mars, and a mission to explore Europa, an icy moon of Jupiter, is in development. NASA-led studies of Earth continue to shed new light on the dynamic and complex interactions that influence the climate, weather and natural hazards people encounter around the world. Ultimately, this journey of discovery will bring American astronauts to a place that has sparked imaginations for generations: Mars.