Sunspots, the dark blemishes that speckle the surface of the sun, can appear and disappear daily, and scientists have been counting them for the last 400 years. Recently, a group of scientists revisited historical sunspot counts and came up with drastically lower numbers than previously reported, a finding that suggests the sun's activity has not varied as wildly as previously thought.
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.
