“It’s seven times the mass of our planet and it’s 500 times further away from the sun than Earth.” – Michael Brown, Ph.D., Astronomer, Cal Tech, Pasadena, California Planet 9X has still not been seen in visible or infrared, but a mass at least seven times the Earth is causing perturbations of large objects in …
from Earthfiles https://ift.tt/2qaFr7F
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