There are several methods currently used by astronomers to detect distant exoplanets from Earth.^[1] As well, some of these same methods, theoretically at least, may be used to detect the Earth as an exoplanet from distant star systems.

In October 2020, astronomers identified 508 stars (with likely related exoplanetary systems) within 326 light-years (100 parsecs) away that have a favorable positional vantage point of detecting Earth as an exoplanet transiting the Sun.^[2][3][4][5] According to the researchers, the transit method is the most popular tool used to detect exoplanets and, additionally, the most common tool to spectroscopically analyze exoplanetary atmospheres.^[2] As a result, the study, based on the transit method, will be useful in the search for life on exoplanets beyond our Solar System by the SETI program, Breakthrough Listen Initiative, as well as, upcoming exoplanetary TESS mission searches.^[2]

• Extrasolar Planets Encyclopaedia by the Paris Observatory

v t e Exoplanets
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
Systems	Exocomet Interstellar Exomoon Tidally detached Rogue planet Orbits Retrograde Trojan Mean-motion resonances Titius–Bode law
Host stars	A B Binary star Brown dwarfs F/Yellow-white dwarfs G/Yellow dwarfs Herbig Ae/Be K/Orange dwarfs M/Red dwarfs Pulsar Red giant Subdwarf B Subgiant T Tauri White dwarfs Yellow giants
Detection	Astrometry Direct imaging list Microlensing list Polarimetry Timing list Radial velocity list Transit method list Transit-timing variation
Habitability	Astrobiology Astrooceanography Circumstellar habitable zone Earth analog Extraterrestrial liquid water Galactic habitable zone Habitability of binary star systems Habitability of F-type main-sequence star systems Habitability of K-type main-sequence star systems Habitability of natural satellites Habitability of neutron star systems Habitability of red dwarf systems Habitability of yellow dwarf systems Habitable zone for complex life List of potentially habitable exoplanets Tholin Superhabitable planet
Catalogues	Nearby Habitable Systems Exoplanet Data Explorer Extrasolar Planets Encyclopaedia NASA Exoplanet Archive NASA Star and Exoplanet Database Open Exoplanet Catalogue
Lists	Exoplanetary systems Host stars Multiplanetary systems Stars with proto-planetary discs Exoplanets Discoveries Extremes Firsts Nearest Largest Heaviest Terrestrial candidates Kepler 1–500 501–1000 1001–1500 1501–2000 K2 Potentially habitable Proper names Discovered exoplanets by year before 2000 2000–2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Other	Carl Sagan Institute Exoplanet naming convention Exoplanet phase curves Exoplanetary Circumstellar Environments and Disk Explorer Extragalactic planet Extrasolar planets in fiction Geodynamics of terrestrial exoplanets Neptunian desert Nexus for Exoplanet System Science Planets in globular clusters Small planet radius gap Sudarsky's gas giant classification
Discoveries of exoplanets Search projects

v t e Exoplanet search projects
Exoplanetology Exoplanet
Ground-based	AAPS APF CORALIE EAPSNet ELODIE EPICS ESPRESSO FINDS Exo-Earths Geneva HARPS HARPS-N GPI HATNet HEK HiCIAO HIRES KELT LCES Magellan MARVELS MASCARA MEarth MicroFUN MINERVA Australis MOA N2K NGTS NESSI OGLE OPSP PlanetPol Project 1640 PARAS SEEDS SETI SOPHIE SPECULOOS SPHERE SuperWASP Systemic TrES XO Telescope ZIMPOL/CHEOPS
Space missions	Past MOST (2003–2019) SWEEPS using HST (2006) CoRoT (2006–2013) EPOXI using Deep Impact (2008–2013) Kepler (2009–2018) detected exoplanets ASTERIA (2017–2020) Current Gaia (2013–present) TESS (2018–present) CHEOPS (2019–present) Hayabusa2 (2021–present) James Webb Space Telescope (2021–present) Planned PLATO (2026) ARIEL (2029) Nancy Grace Roman Space Telescope (mid-2020s) Proposed EXCEDE HabEx LIFE LUVOIR Nautilus Deep Space Observatory New Worlds Mission OST PEGASE Cancelled Darwin EChO Eddington Space Interferometry Mission Terrestrial Planet Finder
Related	Detection methods Discoveries of exoplanets Habitable zone for complex life Lists of exoplanets nearest
Category Commons

Category:Astrobiology Category:Planetary science