Recall the Application About Space Debris in the Atmosphere to Answer

Multiple Choice

Recall the Application about space debris in the atmosphere to answer the following question(s) .
-Recall the Application. Which of the following is TRUE?

A) Over 20,000 pieces of junk as large as a softball are estimated to be orbiting the earth.
B) Modern global positioning satellites (GPS) are at risk of colliding with orbital junk.
C) Solving the space junk problem will require international cooperation.
D) all of the above