An exoplanet or extrasolar planet is a planet that orbits a star other than the Sun. There are planets that are so near to their star that they take only a few hours to orbit and there are others so far away that they take thousands of years to orbit. Some are so far out that it is difficult to tell whether they are gravitationally bound to the star.
The discovery of exoplanets has intensified interest in the search for extraterrestrial life. There is special interest in planets that orbit in a star’s habitable zone, where it is possible for liquid water, a prerequisite for life on Earth, to exist on the surface. The study of planetary habitability also considers a wide range of other factors in determining the suitability of a planet for hosting life.
Besides exoplanets, there are also rogue planets, which do not orbit any star and which tend to be considered separately, especially if they are gas giants, in which case they are often counted
यथा ह्येकेन चक्रेण न रथस्य गतिर्भवेत्। एवं परुषकारेण विना दैवं न सिद्ध्यति।।
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Prelims inShots 2024
Most PROBABLE and HIGHLY recommended topics "you should never miss" to prepare to crack UPSC Prelims Examination.
International Institutions /Groupings /Organisations /Conventions, Biosphere Reserves, Biodiversity Hotspots & Hope Spots, Important Terms of Ancient & Medieval History of India, Mnemonics for UPSC, Indices & Reports, Economic Terms /Glossary, Environment Conventions, Terms, Organizations, Important Constitutional Articles, Wildlife Sanctuaries, Tiger Reserves, National Parks in News, GI Tags in News, Places in News, Rivers in News, Buddhism & Jainism, Species in News, Critical Regions & Marine Conservation Programme, Tiger Reserves in India, Ramsar Sites in India, World Heritage Sites in India, Elephant Corridors /Reserves in India, Government Portals & Government Apps, Know Your State & UTs, Folk Dance /Folk Paintings /Martial Art Forms /Theatre Forms of India, Fact Sheet on Diseases, India's Ranking on Production & Consumption, Tiger Corridors in India, Agriculture, Maritime Exercises, Tribes in News, Space Missions, Facts at a Glance