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Loading video. VIDEO: A computer simulation of how the distribution of planet sizes changes as planetary systems age. The radius gap is evident at around double Earth s radius though it depends on. view more Credit: Animation by Erik Petigura (UCLA); Simulation by James Owen (Imperial College London) There s been a breakthrough in the case of the missing planets. While planet-hunting missions have discovered thousands of worlds orbiting distant stars, there s a severe scarcity of exoplanets that measure between 1.5 and two times Earth s radius. That s the middle ground between rocky super-Earths and larger, gas-shrouded planets called mini-Neptunes. Since discovering this radius gap in 2017, scientists have been sleuthing out why there are so few midsize heavenly bodies. ....
E-Mail Astronomers have discovered new hints of a giant, scorching-hot planet orbiting Vega, one of the brightest stars in the night sky. The research, published this month in The Astronomical Journal, was led by University of Colorado Boulder student Spencer Hurt, an undergraduate in the Department of Astrophysical and Planetary Sciences. It focuses on an iconic and relatively young star, Vega, which is part of the constellation Lyra and has a mass twice that of our own sun. This celestial body sits just 25 light-years, or about 150 trillion miles, from Earth pretty close, astronomically speaking. Scientists can also see Vega with telescopes even when it s light out, which makes it a prime candidate for research, said study coauthor Samuel Quinn. ....