Science & TechnologySource: The Hindu
Discovery of a Unique Four-Planet System by European Space Agency
Monday, 16 February 2026
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Discovery of a Unique Four-Planet System by the European Space Agency reveals a fascinating arrangement of planets orbiting the red dwarf LHS 1903. This system, located 117 light-years from Earth, includes two Super-Earths and two mini-Neptunes, challenging conventional planet formation theories.
Detailed Coverage
- Four-planet system discovered by the European Space Agency.
- Planets orbit the red dwarf star LHS 1903.
- Located 117 light-years from Earth.
- Includes two Super-Earths and two mini-Neptunes.
- Challenges current planet formation theories.
- Outer planet is rocky despite being farther from the star.
- Suggests sequential formation or atmospheric loss for the fourth planet.
- Super-Earths have 2 to 10 times Earth's mass.
- Mini-Neptunes are larger than Earth but smaller than Neptune.
- Fourth planet's surface temperature is estimated at 60°C.
- Potentially supports habitability.
- Host star has 50% of the Sun's mass.
- Star's luminosity is only 5% of the Sun's.
- Represents the most common star type in the Milky Way.
- Discovery raises questions about planetary habitability.
- Highlights the need for revised models of planet formation.
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