The world's largest earth observation satellite is missing

The European Space Agency (ESA) announced yesterday that it had lost contact with Envisat, the largest earth-tracking satellite in human history.

Envisat is the largest satellite tracking planet that people have ever built.

Envisat operators did not receive data from Envisat since April 8, when it flew through Sweden, and so far the effort to reconnect their communications with satellites has not yet worked, the BBC reported.

Envisat - 8.2 tons in weight and 10.5 meters in length - was launched into orbit in March 2002 with 10 devices to monitor the Earth's oceans, ice, soil and air. Designed to operate for 5 years, but Envisat still tracks the earth until April 8. According to ESA's plan, Envisat will be deactivated in 2014.

Envisat's data has been used in 4,000 science projects in 70 countries, including many notable studies on climate change. It photographed the Gulf of Mexico oil spill in 2010. Scientists also used Envisat's ocean currents to predict radiation levels in the Pacific Ocean due to the crisis. panic at Japan's Fukushima power plant in 2011. Envisat is an important tool for countries to deal with illegal fishing.