(UPI) -- Astronomers have discovered a new exoplanet similar in size to Earth.
The new planet, dubbed Kepler-78b, has a radius just 1.17 times and a mass 1.9 times that of Earth. But the planet's proximity to its star -- 100 times closer than Earth is to the sun -- makes its surface temperature range from 2,240 to nearly 5,000 degrees Fahrenheit.