You have travelled from your backyard to distant galaxies. Now for the biggest questions of all: How did the universe begin? How big is it? What is it made of? Humans have found some astonishing answers – and some mysteries that may be solved by someone your age.
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01Hubble Ultra Deep FieldDeep field · ~10,000 galaxies
02The Big Bang & expanding universeCosmology
03Cosmic Microwave BackgroundCosmology · The oldest light
04Dark Matter & Dark EnergyCosmology · The great mystery
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