Professor Brain Cox explaining how big our observable universe is. https://t.co/F2tUBPCOLu https://video.twimg.com/ext_tw_video/1773557357588475904/pu/vid/avc1/748x720/yoiyTP-_n602a2_U.mp4?tag=12
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Professor Brain Cox explaining how big our observable universe is. https://t.co/F2tUBPCOLu https://video.twimg.com/ext_tw_video/1773557357588475904/pu/vid/avc1/748x720/yoiyTP-_n602a2_U.mp4?tag=12
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