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 List Of The Potentially Hazardous Asteroids (PHAs)
(Updated Daily)

 SOUND

Gravitational waves from two black holes colliding, each about 30 times the mass of our sun. The incredibly powerful event, which released 50 times more energy than all the stars in the observable universe, lasted only fractions of a second.
 PHA

Potentially Hazardous Asteroids (PHAs) are currently defined based on parameters that measure the asteroid's potential to make threatening close approaches to the Earth. As of autumn 2016, there are 1731 known PHAs.















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