Two new studies point to peculiar possibilities for planetary evolution.
) have scanned the skies searching for periodic dips in the brightness of nearby stars. This blinking is a sign that a star is hosting a planet, which has crossed the face of the star and temporarily blocked its light.
Some exoplanets detected by astronomers are small, rocky worlds like Mars, and others are large gaseous planets such as Saturn and Jupiter. But researchers have also found worlds with no close analogs in our own solar system. For example, they've discovered exoplanets that are between the size of Earth andIt turns out that these mini-Neptunes might be shedding their"fluffy" outermost shells and shrinking into super-Earths, according to the new research.
An illustration of the exoplanet system TOI 270, which was not the subject of the research by Michael Zhang and colleagues. However, this image depicts a star orbited by one super-Earth and two mini-Neptunes . The researchers used the Hubble Space Telescope and the W.M. Keck Observatory in Hawaii to observe four mini-Neptunes. They noticed that two of their subjects — one called HD 63433c located 73 light-years away from Earth, and another called TOI 560.01 found 103 light-years away — had fast-moving gas in their atmospheres.
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