By Arnab Banerjee WATCH RELATED VIDEO Submit Recently discovered 'TRAPPIST-1 star system has seven planets. It was expected that the atmosphere of those planets was much like earth. But scientists have revealed that a couple of planets of the system can not hold any atmosphere. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.