HD - NASA's Jet Propulsion Laboratory

The final chapter in a remarkable mission of exploration and discovery, Cassini's Grand Finale is in many ways like a brand new mission.

Jupiter is visible all night long, and the Lyrid meteors shower puts on a good show April 22 before dawn.

The search for life beyond Earth needs robots. But to explore distant ocean worlds like Europa, we'll need a new set of tools to drill through ice, reach faraway samples and cross difficult terrain.

For 15 years, the GRACE mission has unlocked mysteries of how water moves around our planet.

The moon hides red star Aldebaran and crescents dazzle after dusk.

Seven Earth-sized planets have been observed by NASA's Spitzer Space Telescope around a tiny, nearby, ultra-cool dwarf star called TRAPPIST-1.

How Cassini's sleuthing revealed an active ocean world.

This month watch bright Venus, Mars and Uranus, comets and Vesta, Plus the sunset glow of dust in our solar system.

On January 24, 2017, Opportunity celebrates 13 years on Mars. On Earth, she's officially a teenager -- and behaving like one.

On Jan. 14, 2005, ESA's Huygens probe made its descent to the surface of Saturn's hazy moon, Titan.