More than 1,100 satellites are orbiting the Earth right now transmitting TV shows and phone calls, collecting rainforest data and spying on missile bases around the planet. Most are expensive, costing tens or hundreds of millions of dollars to build, launch and operate.
Now NASA wants to build a satellite service station that can gas up and repair aging birds, giving them a few years more life before they fall into the Earth's atmosphere and
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.
