An exomoon is a moon that orbits around an exoplanet.

How many exoplanets are there?

A team of transatlantic scientists has discovered an Earth-size exoplanet orbiting in its star's habitable zone.

Scientists expect future space missions to detect hundreds of other exoplanets in coming decades.

The study of worlds outside our solar system will be continued by future spacecraft, such as NASA's Transiting Exoplanet Survey Satellite (TESS) and James Webb Space Telescope.

First, the researchers trained the neural network to identify transiting exoplanets using a set of 15,000 previously-vetted signals from the Kepler exoplanet catalogue.

Hu pioneered a method to detect surface minerals on bare-rock exoplanets and defined the atmospheric chemical signature of volcanic activity, which wouldn't occur on a gas planet.

Then, with the neural network having "learned" to detect the pattern of a transiting exoplanet, the researchers directed their model to search for weaker signals in 670 star systems that already had multiple known planets.

Exoplanets are planets that are outside the solar system.

How do astronomers detect exoplanets?