Nat Geo:
A "hotspot" in the sky near the Big Dipper may be a major source of the ultra-high-energy cosmic rays that routinely bombard the Earth, report physicists using a giant array of specialized telescopes in the Utah desert.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
The asteroid zoomed by Earth at a perfectly safe distance of around 1.8 million miles (2.9 kilometers).
Images show surprise changes to the spacecraft as it interacted with the atmosphere.
