How to find exoplanets

Artistic rendition of stars with exoplanets. Credit : ESO/M. Kornmesser

Since the discovery of the first exoplanet, a planet in orbit around a star other than the Sun, in 1995, over 4000 exoplanets have been discovered. How do we find exoplanets?

There are five main methods of discovering exoplanets.

Radial Velocity Method : Looking at stars dance and change colour.

Transit Method : Looking for the blinking stars.

Direct Imaging Method : Taking a picture of a planet.

Gravitational Microlensing Method : Light distortions through a lens.

Astrometry Method : Detecting tiny movements.