The ESA predicted that the satellite would come crashing down at roughly 10:41 a.m. EST.
Its landing spot was still uncertain but it was expected to splash down somewhere in the Pacific Ocean.
ESA researchers said they don't know how much of ERS-2 will be left since scientists believe most of it will burn up in the atmosphere and what remains is expected to be lost at sea.
On Monday, the ESA shared images captured by the U.K. Space Agency and HEO Robotics of ERS-2 tumbling toward Earth.
ERS-2 stopped operations in 2011 and has been making its way back toward Earth ever since.
It was launched in 1995, four years after its sister satellite ERS-1 to observe and track changes in planets.
ERS-2 specifically was fitted with an additional sensor that gave scientists their first consistent look at the ozone layer.
"It provided us with new insights on our planet, the chemistry of our atmosphere, the behavior of our oceans and the effects of humankind's activity on our environment," ESA's Mirko Albani told The Guardian.
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