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Smallest exoplanets compared to Earth and Mars

Smallest exoplanets compared to Earth and Mars

This chart compares the smallest known exoplanets, or planets orbiting outside the solar system, to our own planets Mars and Earth.

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NASA/JPL-Caltech

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There are water worlds, lava planets, egg-shaped worlds, planets with multiple suns, and even planets with no sun at all! What can we learn from this weird, wondrous variety?
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One of the first exoplanets ever discovered, Gamma Cepehi A b is a comeback story.
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An infographic depicting one of the first exoplanets discovered.
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An unusual, methane-free world is partially eclipsed by its star in this artist's concept.
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Exotic Exoplanet
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This artist's concept depicts in the foreground planet Kepler-62f, a super-Earth-size planet in the habitable zone of its star, which is seen peeking out from behind the right edge of the planet.
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Morning Star (Artist Concept)
Morning Star (Artist Concept)
Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have taken the first ever image of the snow line in an infant planetary system.
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Over its ten years in space, NASA's Spitzer Space Telescope has evolved into a premier tool for studying exoplanets.
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An artist's illustration of Kepler-64b or PH1, a planet discovered by volunteers from the Planet Hunters citizen science project. PH1, shown in the foreground, is the first reported case of a plane...
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Kepler-64b: Four Star Planet
Kepler-64b: Four Star Planet
An artist’s impression showing a newly discovered Jupiter twin gas giant orbiting the solar twin star, HIP 11915. The planet is of a very similar mass to Jupiter and orbits at the same distance fro...
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Artist’s Impression of a Jupiter twin orbiting HIP 11915
Artist's Impression of a Jupiter twin orbiting HIP 11915
This artist concept depicts "multiple-transiting planet systems," which are stars with more than one planet. The planets eclipse, or transit, their host stars from the vantage point of the observer...
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Star System Bonanza
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Do other planets beyond our solar system, called exoplanets, also host life forms?
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HR 8799: An Early Age of a Planetary System
This artist's conception illustrates Kepler-22b, a planet known to comfortably circle in the habitable zone of a sun-like star. It is the first planet that NASA's Kepler mission has confirmed to or...
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Visible-light Color of Planets Plot
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A new NASA-sponsored website, DiskDetective.org, lets the public discover embryonic planetary systems hidden among data from NASA's Wide-field Infrared Survey Explorer (WISE) mission.
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This figure charts 30 hours of observations taken by NASA's Spitzer Space Telescope of a strongly irradiated exoplanet (an planet orbiting a star beyond our own). It shows the very rapid heating th...
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Exoplanet HD 80606b Infrared Light Curve
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This artist's concept illustrates the idea that rocky, terrestrial worlds like the inner planets in our Solar System may be plentiful, and diverse, in the Universe.
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Explore Alien Worlds

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Strange New Worlds

Explore an interactive gallery of some of the most intriguing and exotic planets discovered so far.
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A planetary tour through time. The ancients debated the existence of planets beyond our own; now we know of thousands.

Historic Timeline

A planetary tour through time. The ancients debated the existence of planets beyond our own; now we know of thousands.
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