Prancing with the stars
Over the last 14 years, more than 4,000 worlds around other stars have been spotted by astronomers using the Kepler spacecraft, CoRoT, and TESS.
Most of the exoplanets discovered so far are several times more massive than Earth — closer to the size of Uranus or Neptune. However, some smaller, rocky worlds, similar in size to Venus and Earth, have also been seen in distant solar systems. And the most intriguing of these orbit their stars at the right distance for liquid water to pool on the surface of planets.
Red dwarf stars live for exceptionally long periods, allowing life plenty of time to develop on worlds surrounding them. But, they are also cool, emitting most of their energy as infrared radiation. And, these stars are also highly active, sending out stellar storms that could wreak environmental havoc on worlds huddled close to the stars for warmth.
Potentially habitable planets orbiting red dwarfs would also need to be so close to their star that gravity would significantly warp the planet itself as it orbited. This could fuel heat to drive chemical reactions, or the effect may drive widespread vulcanism around the planet, altering the global climate. Even planets larger than Earth could have their atmospheres driven off by pressure from their local star, reducing chances of life on those worlds. The video below shows a look at Kepler-160b, the innermost of the confirmed planets in that solar system.
The Kepler-160 system, consisting of two planets, Kepler-160 b and c, was discovered in 2014.
The innermost-known planet in this star system, Kepler-160 b, orbits 20 times closer to its star than the Earth does to the Sun. This world, roughly 50 percent larger than Earth, orbits its parent star in just a little over four days.
This new study looks at the orbits of these worlds, suggesting that in addition to KOI-456.04, the system may also contain a fourth massive planet, orbiting around its parent star once every few weeks.
The Cosmic Companion by James Maynard, founder and publisher of The Cosmic Companion. He is a New England native turned desert rat in Tucson, where he lives with his lovely wife, Nicole, and Max the Cat. You can read this original piece here.
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