2015
Exploration
United States
Reusable orbital rockets
A Falcon 9 first stage lands vertically after delivering payload to orbit.
Why it mattered
Collapsed the cost of reaching orbit.
Information Age
2015
2 recorded milestones at this point in the record.
2015
Science
United States
Gravitational waves detected
LIGO records spacetime ripples from two merging black holes.
Why it mattered
A completely new way of observing the universe.
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