A 25-ton Chinese rocket booster will crash into Earth today. What’s the risk?

The core stage of a Chinese Long March 5B rocket is set to fall uncontrollably back to Earth today in a re-entry that China is watching closely and which it says poses little risk.

The roughly 25-tonne (23 metric ton) rocket stage, which was launched on July 24 to deliver the Wentian lab cabin module to China’s incomplete Tiangong space station, is expected to return Earth atmosphere on July 30 at 12:15 p.m. ET, plus or minus 1 hour, according to researchers at The Aerospace Corporation Center for Orbital Debris and Reentry Studies (opens in a new tab).

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