測量出系外行星 Kepler-138b 質量

[peter]

http://www.nasa.gov/image-feature/mars-size-kepler-138b-gets-a-mass



http://www.astronomy.com/news/videos/2015/06/exoplanet-smaller-than-earth-gets-its-size-and-mass-measured

It is simpler to compare the mass and size of Kepler-138b to Earth's mass and size," Jontof-Hutter said. "Kepler-138b is less than 1/10 an Earth mass and half the size of Earth. In kilograms, Kepler-138b is 4 followed by 23 zeros — 4 times 10 to the power of 23 kilograms [5,100 billion trillion pounds]. In kilometers, its diameter is about 6,600 [4,100 miles]."

好強可以量出200 光年外
火星 大小天體

https://www.youtube.com/watch?feature=player_embedded&v=xnB5nDqL-Nk