An exoplanet is a planet that orbits a star other than the Sun. They are also known as extrasolar planets.

As of 2023, over 5,000 exoplanets have been discovered. This number is constantly growing as new discoveries are made.

Gas giants are the most common type of exoplanet. They are large planets that are composed mostly of hydrogen and helium.

The habitable zone is the region around a star where liquid water can exist on the surface of a planet. This is a key factor for the potential for life to exist on a planet.

The size of the planet is not a direct factor in determining its habitability. However, it can affect other factors, such as the presence of liquid water and the atmosphere.

51 Pegasi b was the first exoplanet discovered orbiting a Sun-like star. It was discovered in 1995.

Kepler-452b is considered to be one of the most Earth-like exoplanets due to its size, mass, and location within the habitable zone of its star.

The Kepler mission was launched in 2009 to search for exoplanets. It discovered over 2,600 exoplanets during its mission.

The TESS mission is currently searching for exoplanets. It was launched in 2018 and is expected to discover thousands of exoplanets.

The JWST is being used to study exoplanets. It was launched in 2021 and is expected to provide new insights into the atmospheres and compositions of exoplanets.

TRAPPIST-1e is a planet that is located in the habitable zone of the TRAPPIST-1 system. It is one of the most promising exoplanets for the potential for life.

Proxima Centauri b is a planet that is located in the habitable zone of the Proxima Centauri system. It is the closest known exoplanet to Earth.

Gliese 667 Cc is a planet that is located in the habitable zone of the Gliese 667 system. It is one of the most promising exoplanets for the potential for life.

Kepler-452b is a planet that is located in the habitable zone of the Kepler-452 system. It is one of the most promising exoplanets for the potential for life.