After this date, the orbit was decaying too rapidly and various subsystems were failing.

The orbit was decaying at an increasing rate.

The orbit decayed on November 14, three days after launch.

The orbit of the brown dwarf is slowly decaying.

If our orbit decays after that time, it will make no difference.

The station's orbit decayed, and it re-entered the atmosphere on January 24, 1975.

The orbit eventually decayed, and it reentered the atmosphere several years later.

One day short of a year after its launch, Kosmos 8's orbit decayed.

"Its orbit must be decaying rapidly through gravitational radiation."

The orbit decays at a rate proportional to the inverse third power of the radius.