One of the Trappist-1 Planets Has an Iron Core - Universe Today https://t.co/0eguUKp4j3 @storybywill @universetoday pic.twitter.com/ljz7aa4ZhP
— Universe Today (@universetoday) May 3, 2018
from Twitter https://twitter.com/iPhoneMaster13
May 04, 2018 at 05:14AM
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