Read this sentence from the article: A big chunk of metal lay embedded into the middle of the street, while two police officers puzzled over it.

What main idea does this sentence support?

Satellites begin to lose velocity after many orbits.
Satellites begin to lose velocity after many orbits.

Space trash sometimes does fall all the way to Earth.
Space trash sometimes does fall all the way to Earth.

A satellite must travel at a very high rate of speed to remain in orbit.
A satellite must travel at a very high rate of speed to remain in orbit.

Russian experts think the Sputnik satellites burned up in the atmosphere.