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This list of nearest terrestrial exoplanet candidates contains possible terrestrial ("rocky") exoplanets spaced at a distance of up to 50 light-years from the Solar System, ordered by increasing distance.

They may be composed primarily of silicate rocks and/or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun.

Exoplanets discovered (incomplete)

This list is incomplete, currently containing 34 exoplanets, 11 of which probably lie inside their star's habitable zone.

There are roughly 2,000 stars at a distance of up to 50 light-years from the Solar System (64 of them are yellow-orange "G" stars like our sun). As many as 15% of them can have Earth-sized planets in the habitable zones.

On November 4, 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarf stars within the Milky Way galaxy. Eleven billion of these estimated planets may be orbiting Sun-like stars. The nearest such planet was then as close as 12 light-years away but (see below) is now estimated slightly above four light-years away.

On August 24, 2016, astronomers announced the discovery of a rocky planet in the habitable zone of Proxima Centauri, the closest star to Earth (not counting the Sun). Called Proxima b, the planet is 1.3 times the mass of Earth and has an orbital period of roughly 11.2 Earth days. However, Proxima Centauri's classification as a red dwarf casts doubts on the habitability of any exoplanets in its orbit due to low stellar flux, high probability of tidal locking, small circumstellar habitable zones and high stellar variation. Another likely candidate is Alpha Centauri, Earth's nearest Sun-like star system 4.37 light-years away. Estimates place the probability of finding a habitable planet around Alpha Centauri A or B at roughly 75%. Alpha Centauri is the target of several exoplanet-finding missions, including Breakthrough Starshot and Mission Centaur, the latter of which is chronicled in the 2016 documentary film The Search for Earth Proxima.

Table

Name	Image (artist's concept)	M⊕	R⊕	g	Ts	a	e		D
Proxima Centauri b		≥1.27	~1.1		234 K -39°C	0.05	<0.35		4.22
Proxima Centauri c		~7			39 K -234 °C	~1.489	~0.04		4.22
Barnard's Star b		≥3.23			105 K -168.15 °C	0.404	0.32		5.958
Ross 128 b		≥1.40			213–301 K				11.03
Luyten b		≥2.89	≥1.35		259 K -14 °C	0.091	0.10		12.20
Wolf 1061b		≥1.36	≥1.44						13.8
Wolf 1061c		≥4.3	≥1.64						13.8
Wolf 1061d		≥5.21	≥2.04						13.8
Gliese 876 d		6.8			650 K 377 °C	0.021	0.21		15
Gliese 682 b		≥2							16
Gliese 832 c		≥5.4			251 K -22 °C	0.162	0.03		16.16
82 G. Eridani b		≥2.7			660 K 387 °C	0.1207	0		19.71
82 G. Eridani c		≥2.4			508 K 235 °C	0.2036	0		19.71
82 G. Eridani d		≥4.8			388 K 115 °C	0.3499	0		19.71
Gliese 581 e		≥1.7				0.029	0		20
Gliese 581 c		≥5.6				0.072	0		20
Gliese 581 d		≥5.6	2.34	1.27	233 K -41 °C	0.218	0		20
HD 219134 b		4.5	1.6		700 K 427 °C				21
Gliese 667 Cb		6.30		1.44	445 K 172 °C	0.05	0.09		22
Gliese 667 Cc		3.8		1.32	302 K 29 °C	0.13	0.34		22
61 Virginis b		≥5.1				0.050	0.12		28
HD 85512 b		≥3.6	1.74	1.33	351 K 78 °C	0.26	0.11		36
GJ 180 b		≥2.3			312 K 39 °C				38
TRAPPIST-1b									39.5
TRAPPIST-1c									39.5
TRAPPIST-1d					282.1 K 9 °C				39.5
TRAPPIST-1e					246.1 K -27.1 °C				39.5
TRAPPIST-1f					219 K -54 °C				39.5
TRAPPIST-1g					198.6 K -75 °C				39.5
TRAPPIST-1h					169 K -104 °C				39.5
55 Cancri e (Janssen)		8.6				0.016	0.17		40
HD 40307 b		≥4.2				0.047	0.2		42
HD 40307 c		≥6.8				0.081	0.06		42
HD 40307 d		≥9.2				0.134	0.07		42
HD 40307 e		≥3.5				0.1886	0.15		42
HD 40307 f		≥5.2			385 K 112 °C	0.247	0.02		42
HD 40307 g		≥7.1			284 K 11 °C	0.600	0.29		42

Note: There is no scientific consensus about terrestrial composition of most of the planets in the list. Sources in the "Main source" column confirm the possibility of terrestrial composition.

In September 2012, the discovery of two planets orbiting Gliese 163 was announced. One of the planets, Gliese 163 c, about 6.9 times the mass of Earth and somewhat hotter, was considered to be within the habitable zone, but is probably not terrestrial. In May 2016, the finding of three Earth-like planets of ultracool dwarf TRAPPIST-1 has been released.

Statistics

Note: in most cases the composition of the atmosphere and atmosphere pressure of exoplanets are unknown, so surface temperatures are estimates based on computer models and expert opinions.

See also

• Interstellar travel
• List of exoplanetary host stars
• List of multiplanetary systems
• List of nearest exoplanets
• List of nearest stars and brown dwarfs
• List of potentially habitable exoplanets
• Lists of astronomical objects
• List of Solar twins

References

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20. http://www.hpcf.upr.edu/~abel/phl/tuomi/hec_orbit_GJ_682_b.png
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31. Vogt, Steven (2009). \"A Super-Earth and two Neptunes Orbiting the Nearby Sun-like star 61 Virginis
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External links

• Super-Earth Candidates in or near Habitable Zone

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Planet Definition IAU Planetary science
Main topics	Exoplanet Exoplanet orbital and physical parameters Methods of detecting exoplanets Planetary system Planet-hosting stars
Sizes and types	Terrestrial Carbon planet Coreless planet Desert planet Dwarf planet Hycean planet Ice planet Iron planet (Super-Mercury) Lava planet Ocean world Mega-Earth Sub-Earth Super-Earth Gaseous Eccentric Jupiter Mini-Neptune (Gas dwarf) Helium planet Hot Jupiter Hot Neptune Gas giant Ice giant Super-Jupiter Super-Neptune Super-puff Ultra-hot Jupiter Ultra-hot Neptune Other types Blanet Brown dwarf Chthonian planet Circumbinary planet Circumtriple planet Disrupted planet Double planet Ecumenopolis Eyeball planet Giant planet Mesoplanet Planemo Planet/Brown dwarf boundary Planetesimal Protoplanet Pulsar planet Sub-brown dwarf Sub-Neptune Toroidal planet Ultra-cool dwarf Ultra-short period planet (USP)
Formation and evolution	Accretion Accretion disk Asteroid belt Circumplanetary disk Circumstellar disc Circumstellar envelope Cosmic dust Debris disk Detached object Disrupted planet Excretion disk Exozodiacal dust Extraterrestrial materials Extraterrestrial sample curation Giant-impact hypothesis Gravitational collapse Hills cloud Internal structure Interplanetary dust cloud Interplanetary medium Interplanetary space Interstellar cloud Interstellar dust Interstellar medium Interstellar space Kuiper belt List of interstellar and circumstellar molecules Merging stars Molecular cloud Nebular hypothesis Oort cloud Outer space Planetary migration Planetary system Planetesimal Planet formation Protoplanetary disk Ring system Rubble pile Sample-return mission Scattered disc Star formation
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