Astronomer Derrick Pitts of the Franklin Institute in Philadelphia told our sister station WPVI-TV that the light was from a SpaceX launch.
The National Weather Service also said the light is "most likely" from the rocket.
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According to SpaceX, there was a launch at 6:01 a.m. at Kennedy Space Center in Florida.
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SpaceX announced that 60 satellites were successfully entered into orbit after the Falcon 9 rocket liftoff.