Big Bang
The Hubble Space Telescope observed that galaxies outside our own Milky Way are away. This made us think that the whole universe has been expanding. When the universe was contained in a single point. It happened a violent event, "The big bang".
One of the questions is whether the universe will expand forever or someday stop.
NASA has launched two missions to study the cosmic background radiation, and to take pictures to better understand this phenomenon.
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