Earth's orbit may be in trouble. Why space debris is to blame.

You might think space as a vast emptiness. But according to the European Space Agency, it's getting incredibly crowded – at least around our planet. A European Space Agency report released April 1 studied the space above Earth. The report says that if space debris buildup is not controlled soon, the area surrounding our planet may become so congested that we won't be able to use certain orbits. More

(Source: USA Today - Apr 21)