NASA Announces Discovery of another "Earth like" Planet

Kepler-452b orbits a G2-type star in the constellation Cygnus and 1,400 light-years away. Kepler-452b has an average orbital radius of 1.05 AU which is 5% larger than Earth's orbit with a year of  about 385 earth days. The star is similar to our sun but brighter and warmer such that Kepler-452b  receives 10% more energy than the Earth. Kepler-452b is 1.6 times the size of the Earth with approximately 5 times the Earth's mass giving it a surface gravity of 1.95 g's. 

All else being equal receiving 10% more energy suggests average temperature of  43.65o C (110.57o F) but since Kepler-452b's surface gravity is 1.95 g's. it's surface atmosphere would likely be several times Earth's meaning that it would trap more heat, making it even hotter. This factor could be increased if like Mars and Venus Kepler-452b's atmosphere is largely CO2. Given its denser atmosphere, an increased energy from its sun, Kepler-452b is probably more like Venus than Earth.  

Reference: Kepler-452b: Earth's Bigger, Older Cousin -- Briefing Materials


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