This artist's conception illustrates a Jupiter-like planet alone in the dark of space, floating freely without a parent star.

ESO’s VLT identified our Sun's oldest twin and provides new clues about stars that may host terrestrial rocky planets.

Audience: 5th grade and older (introduces Kelvin) This slide shows the difference in temperature between planets orbiting an M Dwarf star and our Sun. The second view shows their relative distan...

Audience: 3rd grade and older This slide shows the difference in temperature between planets orbiting an M Dwarf star and our Sun. The second view shows their relative distance from their star.

Artist's impression of the five-Earth mass planet, Gliese 581 c, found in the habitable zone around the red dwarf Gliese 581, with the instrument HARPS on the ESO 3.6-m telescope.

How do astronomers take actual pictures of exoplanets, and why is it such a difficult thing to do? Josh from PlanetQuest talks about what's involved in making an exoplanet portrait.

This artist's concept illustrates the hottest planet yet observed in the Universe. The scorching ball of gas, a "hot Jupiter" called HD 149026b, is about 3 times hotter than the surface of Venus.

First light image from two of the CCD modules of the Kepler mission.

The habitable zone is the distance from a star where one can have liquid water on the surface of a planet. If a planet is too close to its parent star, it will be too hot and water would have evapo...

Of the more than 1,000 verified planets found by NASA's Kepler Space Telescope, eight are less than twice Earth-size and in their stars' habitable zone. All eight orbit stars cooler and smaller tha...

This image from ESO's Very Large Telescope (VLT) shows the newly discovered planet HD95086 b, next to its parent star.

This episode of "Hubble at 25" uncovers Hubble's Key role in the study of planets beyond our solar system.

This map, the first-ever of the surface of an exoplanet, shows temperature variations across the cloudy tops of a gas giant called HD 189733b.

The telescope studied comets and asteroids, counted stars, scrutinized planets and galaxies, and discovered soccer-ball-shaped carbon spheres in space called buckyballs.

One of the first exoplanets ever discovered, Gamma Cepehi A b is a comeback story.

Video of the Kepler spacecraft launch from March 2009.

An international team of scientists discovered more than 100 planets based on images from Kepler operating in the ‘K2 Mission’.

These plots from NASA's Spitzer Space Telescope show light from a distant planet, GJ 436b, and its star, as measured at six different infrared wavelengths.

These doomed worlds were among the first and creepiest to be discovered. They orbit an undead star known as a pulsar. 

This chillingly haunted galaxy mysteriously stopped making stars only a few billion years after the Big Bang!

Este planeta lejano puede parecer un refugio amigable… ¡pero no te dejes engañar! ¡El clima en este mundo es mortal! ¡El color azul cobalto del planeta proviene de una atmósfera brumosa e incendiar...

Daniel Fabrycky from the Kepler science team put together a visualization of all the multiple-planet systems discovered by the Kepler spacecraft as of February of 2011.

This animation shows the first-ever map of the surface of an exoplanet, or a planet beyond our solar system.

Using data from NASA's Kepler and Spitzer Space Telescopes, scientists have made the most precise measurement ever of the size of a world outside our solar system, as illustrated in this artist's c...

Astronomers have discovered the first Earth-size planet orbiting a star in the "habitable zone" -- the range of distance from a star where liquid water might pool on the surface of an orbiting plan...