Potentially hazardous asteroids, or PHAs in NASA-speak, are space rocks in orbits that come within 5 million miles (8 million kilometers) of Earth and are large enough to cause damage on regional or global scale if they were ever to hit our planet.
Don't take this lightly; asteroid strikes have caused numerous extinction events on Earth over the life of the planet. We humans should be forewarned and beware the fate of the dinosaur befalling humanity.
The $320 million WISE telescope snapped images of about 600 near-Earth asteroids, with about 135 of them being completely new discoveries. The telescope also observed millions of other objects, including distant galaxies and star nurseries.
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