Our Expanding Universe
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Khan AcademyAmerican Museum of Natural History
Our Expanding Universe
In 1998, two independent teams of astrophysicists discovered a baffling phenomenon: the Universe is expanding at an ever-faster rate. The current understanding of gravity can't explain this cosmic acceleration. Scientists think that either a mysterious force called dark energy is to blame—or a reworking of gravitational theory is in order ...
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The universe is expanding, and it is accelerating. If this continues, the future of astronomy is going to be very lonely. This scenario is known as the "Big Freeze." Dark energy is currently pushing galaxies apart faster and faster. If this force remains constant or gets stronger, distant galaxies will eventually be pushed so far away that their light can no longer reach us. Billions of years from now, the night sky will change dramatically. The Milky Way will have merged with Andromeda to form
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