Scale 03 · Milky Way Intermediate

Exoplanets — worlds beyond the Solar System

Over 5,700 planets have been confirmed orbiting other stars. They range from scorching gas giants closer to their sun than Mercury, to frozen super-Earths, to potential ocean worlds — and maybe, somewhere, worlds like ours.

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.

Frequently asked questions

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