An exoplanet is a planet outside our solar system that usually orbits a star in our galaxy. More than 7,000 have been found in the Milky Way since the first confirmed discovery in the 1990s, and "billions more remain to be discovered", said Tech Explorist.

Astronomers have found some pretty wild exoplanets. Some are balls of lava the temperature of hell, one is partially made of diamond, and another may rain molten iron. However, not all exoplanets are this extreme.

The exoplanet HD 20794d swoops in and out of its habitable zone every few hundred days, making for an extreme climate.

Thirty years after the discovery of the first exoplanet, astronomers have detected more than 7,000 of them in our galaxy. But there are still billions more to be discovered. At the same time, exoplanetologists have begun to take an interest in their characteristics,

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life.

It is located in a star system less than 20 light-years away, making it one of the closest candidates for further research.

Astronomers who identified HD 20794 d say its proximity to its host star and orbital pattern suggest it could hold water.

Astronomers have officially confirmed the existence of HD 20794 d, a super-Earth located just 20 light-years away, with conditions that could make it one of the most promising exoplanets for life beyond our solar system.