K2-18bとは 意味・読み方・使い方

固有名詞

K2-18b

1. (planets) A planet in K2-18 star system, Milky Way Galaxy, Leo constellation; has been studied as a potential habitable world.
   • 2019 September 12, “Water found in atmosphere of planet beyond our solar system”, in Reuters‎, archived from the original on 22 April 2025, World:

     Aside from the tremendous distance separating Earth from K2-18b, the exoplanet is likely exposed to far more radiation than Earth, diminishing the prospects for life evolving there.

   • 2025 April 16, Carl Zimmer, “Astronomers Detect a Possible Signature of Life on a Distant Planet”, in The New York Times‎, →ISSN, →OCLC, archived from the original on April 21, 2025, Science‎:

     No matter how the scientists revisited their readings, the signal stayed strong. They concluded that K2-18b may in fact harbor a tremendous supply of dimethyl sulfide in its atmosphere, thousands of times higher than the level found on Earth. This would suggest that its Hycean seas are brimming with life.