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The super-Earth exoplanet 55 Cancri e, depicted with its star in this artist's concept, likely has an atmosphere thicker than Earth's but with ingredients that could be similar to those of Earth's atmosphere.

This artist's concept shows what exoplanet Kepler-1649c could look like on its surface.

Three possible interiors of the TRAPPIST-1 exoplanets. All seven planets have very similar densities, so they likely have a similar compositions.

A deployed half-scale starshade with four petals at NASA Jet Propulsion Laboratory, Pasadena, CA., in 2014. The flower-like petals of the starshade are designed to diffract bright starlight away from telescopes seeking the dim light of exoplanets.

With the discovery of an eighth planet, NASA's Kepler-90 system is the first to tie with our solar system in number of planets. This is an artist's concept.

This artist's illustration of the exoplanet LHS 3844b, shows the planet's surface may be covered mostly in dark lava rock, with no apparent atmosphere, according to observations by NASA's Spitzer Space Telescope.

This illustration based on computer modeling and data from NASA's Kepler Space Telescope, represents how hot Jupiters of different temperatures and different cloud compositions might appear while flying over the dayside of these planets on a spaceship.

Imagine standing on the surface of the exoplanet TRAPPIST-1f. This artist concept is one interpretation of what it could look like.

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