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Researchers: Chinese rocket booster to hit Earth in uncontrolled descent

This weekend remnants of the massive Long March 5B rocket will begin its re-entry from space and because of its considerable size, debris may strike across a wide swath of the globe.

By Doug Cunningham, UPI

Published Jul 28, 2022 1:50 PM EDT | Updated Jul 30, 2022 7:57 AM EDT

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The Long March 5B rocket, carrying China's Tianhe space station core module, lifts off from the Wenchang Spacecraft Launch Site in Hainan Province, China, in April 2022. A 25-ton rocket stage from another Long March 5B launch is expected to hit Earth in an uncontrolled descent on Sunday. (Matjaz Tancic/EPA-EFE)

July 27 (UPI) -- A hunk of Chinese space rocket junk weighing roughly 25 tons will fall back to Earth early Sunday, according to researchers at the Aerospace Corp.'s Center for Orbital Re-entry and Debris Studies.

CORDS researchers predict the rocket body re-entry into Earth's atmosphere will happen Sunday based on current projections. As of Saturday morning Aerospace was predicting re-entry on Saturday around 1:15 p.m. EDT (1:15 a.m., Sunday in China).

Our latest prediction for #CZ5B rocket body reentry is:
🚀30 Jul 2022 17:15 UTC ± 1 hour
Reentry will be along one of the ground tracks shown here. It is still too early to determine a meaningful debris footprint. Follow this page for updates:  https://t.co/SxrMtcrMrs pic.twitter.com/DkOmRPuIM1

— The Aerospace Corporation (@AerospaceCorp) July 30, 2022

China's Long March 5B rocket launched July 23 to put a module of the Tiangong space station into orbit. China's space agency said the Wentian lab module docked at the Tiangong space station early Monday.

According to CORDS researchers, the falling Chinese space debris is 53.6 meters high and, due to the uncontrolled nature of its descent, there is "a non-zero probability of the surviving debris landing in a populated area."

The core stages of orbital-class rockets are built to be steered safely into the sea or over sparsely populated areas. But the Long March 5B core stage goes into orbit with its payload and that sets up an uncontrolled crash back to Earth.

The researchers say 20% to 40% of the mass will reach the ground. That would mean 5.5-9.9 tons would impact the Earth, according to Aerospace.

In a statement last year about another piece of Chinese rocket debris falling to Earth, NASA administrator Bill Nelson said, "It is clear that China is failing to meet responsible standards regarding their space debris."

China is expected to launch the third and final Long March 5B rocket this fall to carry the last of three space station modules into orbit.

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