How many exoplanets have been confirmed and how fast is the count growing?

As of late 2026, over 5,700 exoplanets have been confirmed, with thousands more candidates awaiting confirmation in the Kepler, K2, and TESS datasets. The count grew slowly until NASA's Kepler Space Telescope (2009–2018) revolutionised the field with its transit survey — discovering over 2,600 confirmed planets and demonstrating that planets are not the exception but the rule: most stars host planets, and small rocky planets are more common than giant ones. The TESS mission (2018–present) continues the search across the full sky. The NASA Exoplanet Archive maintains the definitive confirmed planet count.

What is the habitable zone and does being in it mean a planet has life?

The habitable zone (sometimes called the "Goldilocks zone") is the range of orbital distances around a star where liquid water could exist on a rocky planet's surface, given sufficient atmospheric pressure. Too close and water evaporates; too far and it freezes. Earth is comfortably within the Sun's habitable zone. However, being in the habitable zone is necessary but not sufficient for life. A planet also needs: a stable long-term climate, the right atmospheric composition (not too thick or thin), protection from stellar flares, and liquid water sustained over billions of years. Mars is at the outer edge of the habitable zone but has a thin atmosphere and a frozen surface. Venus is technically within the inner edge but has runaway greenhouse warming at 465°C. Habitability is far more complex than distance alone.

What is the nearest known exoplanet to Earth?

The nearest confirmed exoplanet is Proxima Centauri b — a roughly Earth-mass planet orbiting Proxima Centauri, the closest star to the Sun at just 4.24 light-years. It orbits in the habitable zone with a period of 11.2 days. However, its habitability is uncertain: Proxima Centauri is a red dwarf that regularly produces intense UV flares that could strip away an atmosphere. A second planet candidate, Proxima d, may also exist. The Alpha Centauri system also contains candidate planets. Our stars guide describes the stellar neighbourhood. For detection methods, see our how we find exoplanets guide.

Can we directly image exoplanets?

Yes — direct imaging has confirmed a small number of exoplanets, mostly young, massive, hot giants far from their stars, where the planet's own infrared glow makes it detectable against the star's glare. The challenge is extreme: Earth seen from the nearest star would be about 10 billion times fainter than the Sun at visible wavelengths. Coronagraphs (which block the star's light) and advanced image processing techniques make direct imaging possible in limited cases. JWST has captured direct images of several previously known planets and their thermal emission. The upcoming Habitable Worlds Observatory (planned 2040s) is specifically designed to directly image Earth-sized planets around nearby Sun-like stars and search for biosignature gases like oxygen and methane.

Exoplanets — Worlds Beyond Our Solar System

The main classes of exoplanet

Our Solar System contains four rocky planets and four gas/ice giants. The wider galaxy is far more diverse. Survey statistics from Kepler reveal that the most common planets are types we don't even have locally: sub-Neptunes and super-Earths. Hot Jupiters — the first class detected — are actually rare.

Hot Jupiter

Gas giants orbiting extremely close to their star, with periods of just days. Abundant in early transit surveys because easy to detect; probably rare by number.

Sub-Neptune / Mini-Neptune

The most common planet type in the galaxy. 2–4× Earth's radius. Thick gaseous envelope over a rock/ice core. Our Solar System has none.

Super-Earth

1–2× Earth's radius. May be rocky or ocean worlds. Potentially habitable if in the right temperature zone. Very common around red dwarf stars.

Earth-analogue

Near Earth-size planets in the habitable zone. The prime targets in the search for biosignatures. Still rare in confirmed catalogues due to detection difficulty.

The search for habitable worlds

Finding planets is now routine. Characterising them is the frontier. JWST has demonstrated that transmission spectroscopy can detect molecules in exoplanet atmospheres — recently detecting CO₂ and methane in a sub-Neptune. See our JWST exoplanet atmosphere news article for the latest result.

The techniques used to find and study exoplanets are covered in detail in our how we find exoplanets guide. For the dictionary definition, see the exoplanet entry.

Exoplanets — worlds beyond the Solar System

The main classes of exoplanet

The search for habitable worlds

Frequently asked questions