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Many considerations come to the forefront when planning space travel beyond the moon. Scientists are currently working on overcoming the many challenges and testing their solutions. The Universe S04E10 PULSARS & QUASARS - BluRay 1080p https://www.youtube.com/watch?v=n7UNhx49wfw The Universe S04E12 EXTREME ENERGY - BluRay 1080p https://www.youtube.com/watch?v=KfQD3O3Lp0E The Universe S03E10 STRANGEST THINGS - BluRay 1080p https://www.youtube.com/watch?v=iNB2P7V5uC4 The Universe S03E09 ANOTHER EARTH - BluRay 1080p https://www.youtube.com/watch?v=ojwXInq8_rs The Universe S05E01 - 7 WONDERS OF THE SOLAR SYSTEM - BluRay 1080p https://www.youtube.com/watch?v=slIg8FUOKuU