Facts about Chang'e-4

1. 06

   Yutu-2 rover's wheels experienced unexpectedly high friction on Chang'e-4's landing site regolith, requiring engineers to adjust drive commands and reduce wheel slip by approximately 40 percent during operations.

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2. 05

   Atomic composition analysis by Chang'e-4's onboard spectrometer revealed the Von Kármán crater floor contains higher concentrations of thorium and potassium than typical lunar highlands, suggesting ancient volcanic activity.

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3. 04

   During its first year of operations, Chang'e-4 detected over 2,000 cosmic ray events using its neutron detector instrument, providing unprecedented measurements of lunar radiation exposure for future human missions.

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4. 03

   Chang'e-4's lander transmitted data through the Queqiao relay satellite positioned at the Earth-Moon Lagrange point L2, approximately 65,000 kilometers beyond the lunar far side.

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5. 02

   The Yutu-2 rover accompanying Chang'e-4 discovered unusual subsurface materials at depths up to 40 meters using ground-penetrating radar imaging.

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6. 01

   In January 2019, Chang'e-4 became the first spacecraft to land on the Moon's far side, touching down in the Von Kármán crater.

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