Because of the drag of air molecules bouncing off Tiangong-1, the station's altitude dropped, and the descent accelerated quickly in the last few days.
After the Chinese space agency lost control of Tiangong-1, it was just a matter of time before it crashed back into Earth. Most parts of Tiangong-1 were burned up in the re-entry process as the remaining debris landed over the South Pacific, added the report.
Tiangong-1, or "Heavenly Palace", was placed into orbit in September 2011, acting as a testing ground for China's efforts to put a permanent space station into orbit around 2022.
China said the experimental Tiangong 1 space lab mostly burned up upon re-entry Monday morning. U.S. military radars at the Joint Force Space Component Command (JFSCC) tracked the object and confirmed reentry on April 1 - no joke.
The orbit of the Space Station declined over the course of next two years.
As Tiangong-1 plunges into Earth's atmosphere, it will ignite and break into large chunks before crumbling further.
"The JFSCC works alongside government, industry and global partners to track and report reentries, to include today's Tiangong-1 reentry, because the space domain is vital to our shared worldwide security interests", Major General Stephen Whiting, of the Vandenberg Air Force Base in California, said in a statement. It had originally said that the space station was expected to re-enter off the coast of Brazil in the South Atlantic, near the cities of Sao Paulo and Rio de Janeiro, reported Skynews.
With the odds of any one person being struck by space debris at 70 million-to-one, the chances that it would actually hurt a human were pretty remote. Two sets of crews visited the vehicle during its time in orbit, one of which included China's first female astronaut.
The main body and the solar panels of the Tiangong-1 Chinese space station are visible in this radar image taken while the spacecraft was still orbiting Earth.
It hosted Chinese astronauts on several occasions as they performed experiments and even taught a class that was broadcast in schools across the country.
The 8.5-tonne Tiangong-1, with a length of 10.4 metres and maximum diametre of 3.35 metres, providing a room of 15 cubic meters for three astronauts to live and work, was launched by the Long March-2FT1 carrier rocket at the Jiuquan Satellite Launch Centre in northwest China on September 29, 2011. It also plans to send a manned mission to the moon in the future.