Is it possible for earth-sized Jovian planets to exist?

What fraction of solar-type stars might be precluded from having Earth-like planets through occupation of the habitable zone by giant planets? read more

Within the Solar System, four Jovian planets exist – Jupiter, Saturn, Uranus and Neptune. A planet designated as Jovian is hence a gas giant, composed primarily of hydrogen and helium gas with varying degrees of heavier elements. In addition to having large systems of moons, these planets each have their own ring systems as well. read more

On February 22, 2017, a team of astronomers announced discovery of seven earth-sized planets orbiting the star TRAPPIST-1.More significantly, three of the seven planets orbit within the star’s habitable zone, the region around a star where liquid water might exist on a planet’s surface. read more