Scientists have long recognized that the universe has been growing larger since its origin 13.7 billion years ago in an extremely rapid expansion called the “Big Bang.” But we assumed that this expansion should be slowing down due to the pull of gravity. In 1998, however, two teams of astrophysicists discovered that the expansion is actually speeding up. They observed a mysterious form of “energy” that opposes gravity and is causing the galaxies throughout the universe to move apart faster and faster.
It’s as if you dropped this magazine and, instead of falling to the floor, it suddenly soared toward the ceiling. That would certainly signal the presence of an unexpected force of some kind. In the same way, the galaxies’ accelerated expansion signaled the presence of a previously unknown entity in the universe.
The discovery of “Dark Energy” is arguably the most important scientific breakthrough of the last 50 years. A full understanding of it eventually could have an effect on our daily lives.
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