On March 18, 1965, cosmonaut Alexei Leonov became the first person ever exit a space vehicle and take a so-called "spacewalk." The Voskhod ("Sunrise") was a modifed Vostok capsule such as was used by Yuri Gagarin. The 16.4-foot (5 meters) Voskhod carried two or three cosmonauts for up to 14 days in Earth orbit.
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.
