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From earth. studying the season and the unseen. dark matter is thought to be the glue that holds galaxies together. dark energy, a phenomenon that drives cosmic objects apart. in theory, causing the universe to expand at an accelerated rate. >> we don't know what the universe is made of. we don't know what the fundamental building blocks are of this universe as it stands today. it's a really fundamental embarrassment, frankly, that we don't know, essentially, what more than 90% of the universe is. >> reporter: and while that might be throwing scientists for a loop now, here's something a littl...
Source: archive.org