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TagHabitable zone

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Planets and exoplanets of unexplored galaxies. Sci-Fi. New worlds to discover. Colonization and exploration of nebulae and galaxies

The Search for Extraterrestrial Life 15

Recent news features Earth-like planets and water worlds — and how comet impacts may be providing Europa’s oceans with material

In our universe: Here are the James Webb Space Telescope’s best images from a spectacular year first year (it launched December 25, 2021). Could there be such a thing as “dark light?” Science writer Tibi Puiu tells us at ZME Science that some physicists think that the mysterious dark matter of the universe is made out of dark photons: “A new study found that hypothetical particles called dark photons can explain discrepencies in the ‘cosmic web’.” (December 14, 2022) “First introduced in 1986 by physicist Bob Holdom, dark photons, also known as ‘heavy photons’ or ‘hidden photons’, are supposed to be gauge bosons for dark matter. Dark photons and regular photons are expected to mix, such that the dark photons Read More ›

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Six worlds

New Class of “Hycean” Exoplanets May Feature Life

The new James Webb Telescope will enable much clearer resolution for the composition believed necessary for hosting life

A group of Cambridge astronomers, studying the more than 4000 confirmed exoplanets, think that hydrogen-rich planets may host life. These “Hycean” planets are more numerous than planets similar to Earth and are easier to observe, especially through the new James Webb telescope, to be launched later this year. They are thought to be completely covered by oceans and are termed “mini-Neptune water worlds”: Many of the prime Hycean candidates identified by the researchers are bigger and hotter than Earth, but still have the characteristics to host large oceans that could support microbial life similar to that found in some of Earth’s most extreme aquatic environments. These planets also allow for a far wider habitable zone, or ‘Goldilocks zone’, compared to Read More ›

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red dwarf star sun space view, 3d render

Could Red Dwarf Stars Host Planets With Intelligent Life?

Red dwarfs are much more numerous than brighter yellow dwarfs like our sun

Our Sun is a yellow dwarf star, shiny but comparatively short-lived. Red dwarfs are said to be the most common and longest-lived type of star in our galaxy. They are long-lived because they do not emit much radiance. How large are their habitable zones? A key problem turns on how much light they emit that is useful for life. That was quite a topic of discussion earlier this year at Centauri Dreams (dedicated to “Imagining and Planning Interstellar Exploration”). Astronomer and mathematician Henry Cordova offers some thoughts: All else being equal, the radiant flux received by the planet must then be directly proportional to the luminosity of the star, and inversely proportional to the square of the planet’s distance from Read More ›