1 00:00:00,000 --> 00:00:09,040 "How wide is Hubble's primary mirror?" 2 00:00:09,040 --> 00:00:14,000 The Hubble telescope mirror is a giant piece of  glass eight feet across. It's almost a parabolic   3 00:00:14,000 --> 00:00:18,880 mirror, it's very powerful how far can you see? The farthest we've been able to see with the   4 00:00:18,880 --> 00:00:29,840 Hubble telescope goes back about 6 to 800 million  years after the expansion of the universe began. 5 00:00:29,840 --> 00:00:45,128 [ MUSIC ]