Much like volcanoes on Earth, a 100 mile-wide, 13,000 foot-high mountain on the cold dwarf planet sports a deep depression (35 mi. across). Its features are. If this is indeed a volcano, it is a cryovolcano, which may erupt with cold volatiles such as liquid nitrogen or, perhaps, water.
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.
