Astronomers have recently observed an 'inside-out' planetary system around the red dwarf star LHS 1903, located approximately 117 light-years away in the Lynx constellation. This system, studied using the European Space Agency's Cheops space telescope, comprises four planets: two rocky super-Earths and two gaseous mini-Neptunes. Notably, the innermost planet is rocky, while the next two are gaseous, and the fourth planet, which current planetary formation theory suggests should be gaseous, is instead rocky. This unusual arrangement challenges existing planet formation theories, as it contradicts the typical model where rocky planets form closer to the star due to higher temperatures (The Hindu, February 15, 2026). As Thomas Wilson from the University of Warwick stated, 'This system challenges that by giving us a rocky planet outside of gas-rich planets,' describing it as 'a system built inside-out.'
ASTRONOMY
Astronomers Discover Unusual 'Inside Out' Planetary System Formation

Astronomers discovered an 'inside-out' planetary system around LHS 1903, defying formation theories with a rocky planet outside gaseous ones, raising questions about planet dynamics and habitability.
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