Exoplanets: A World Outside of Our Own
Over 6,000 exoplanets have been discovered in the three decades since the first planet was discovered outside our solar system. NASA’s definition of an exoplanet is “any planet outside of our solar system.”
Over 6,000 exoplanets have been discovered in the three decades since the first planet was discovered outside our solar system. NASA’s definition of an exoplanet is “any planet outside of our solar system.”

On August 30, 2026, National Aeronautics and Space Administration (NASA) launched its newest space telescope, the Nancy Grace Roman Space Telescope (Roman), named after NASA’s first Chief of Astronomy, Nancy Grace Roman.
Are we Alone in the Universe?
The planet Mars holds an austere beauty in its barrenness. Its scars hint at a time when it could have harbored life when great rivers carved deep into its dusty surface. However, billions of years later it appears to be not much more than a massive red desert capped by two spans of ice. For 15 years scientists have been searching for liquid water at Mars’ poles, and finally, on July 25th, 2018, water was discovered.