Why is the Long March rocket unlikely to burn up entirely?

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The Long March Rocket's Size and Composition Make Complete Atmospheric Burn-up Unlikely

The first stage of China's Long March 5B rocket is unlikely to burn up entirely upon re-entry into Earth's atmosphere due to its considerable mass and the nature of its materials. Weighing up to 18 tonnes, the sheer size of the booster means that significant pieces are expected to survive the fiery descent. Furthermore, the materials used in its construction do not appear to separate during re-entry, a characteristic that increases the risk of larger fragments reaching the ground.
Significant Mass Impedes Complete Incineration

The substantial weight of the Long March rocket's first stage, reaching up to 18 tonnes, is a primary factor contributing to its probable survival during atmospheric re-entry. Typically, smaller objects are consumed by the intense heat generated by atmospheric friction as they approach Earth. However, the immense mass of this rocket stage suggests that it will not be fully incinerated, leading to the expectation that substantial debris will remain.
Non-Separating Materials Enhance Re-entry Risk

Adding to the concern is the composition of the Long March 5B rocket. Experts indicate that if the rocket is constructed from materials that do not break apart during re-entry, the risk is amplified. This suggests that the booster stage's components are likely to remain intact to a greater degree than those of rockets designed to fragment more readily, thereby increasing the potential for larger, surviving pieces.
Design Lacks Controlled Re-entry Mechanism

Unlike some other space agencies that implement controlled re-entry procedures, such as the use of retrorockets to guide debris into designated areas, the Long March 5B appears not to have been designed with such a capability. This lack of a controlled descent mechanism means that the booster stage is in an uncontrolled free-fall, making its trajectory and the ultimate fate of its components more unpredictable. For instance, Russia employed retrorockets to manage the re-entry of its Mir space station.

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Why is the Long March rocket unlikely to burn up entirely?

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