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Last Update: April 18, 2014


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These are artistic representations of all the planets around other stars (exoplanets) with any potential to support surface life as we know itAll of them are larger than Earth and we are less certain about their composition and habitability, but they represent the best objects of interest for future observationsThey are ranked from best to worst with the Earth Similarity Index (ESI), a measure of Earth-likeness, but none yet seems to be a true Earth-like planet. This selection of worlds is also subject to change as new interpretations or astronomical observations are made. Earth, Mars, Jupiter, and Uranus are shown for scale on the right.

The Future Study of Earth-like Worlds


Watch Online Cosmos: A Spacetime Odyssey

https://sites.google.com/a/upr.edu/planetary-habitability-laboratory-upra/cosmos

Distribution of Potentially Habitable Exoplanets
DatabaseSubterran
(Mars-size)
Terran
(Earth-size)
Superterran
(Super-Earth)
Total
Habitable Exoplanets Catalog (1)
012021
NASA Kepler Candidates (2)
176169

All Known Exoplanets

Confirmed Exoplanets (3)

NASA Kepler Candidates (4)

1,783

3,845


Table Notes

(1) The database of the Habitable Exoplanets Catalog includes both confirmed and unconfirmed exoplanets.
(2) Numbers based on the NASA Kepler Candidates waiting for confirmation, but some already confirmed.
(3) Confirmed planets listed by the Extrasolar Planets Encyclopedia plus any recent corrections.
(4) Most of NASA Kepler Candidates are still unconfirmed exoplanets.


Recommended Resources



https://www.edx.org/course/anux/anux-anu-astro2x-exoplanets-1443


Help Search for Exoplanets and Extraterrestrial Life from Home





Travel to the Exoplanets from Home





http://eyes.jpl.nasa.gov/exoplanets/