The Covid lockdowns did WHAT to the Moon?!

A recent study has revealed an unexpected consequence of the global lockdowns imposed in 2020 to curb the spread of COVID-19: a measurable cooling of the Moon's surface.

Indian researchers from the Physical Research Laboratory (PRL) analysed night-time temperatures at six different locations on the Moon's near side between 2017 and 2023. Using data from NASA's Lunar Reconnaissance Orbiter, they discovered a consistent temperature drop of 8-10 Kelvin during the strictest lockdown period of April-May 2020 compared to previous years.

For instance, the coldest temperature was recorded in 2020, with a value of 96.2 K at one location. In contrast, post-lockdown years like 2021 and 2022 saw a gradual warming trend as human activity resumed.
The researchers posit that this unusual cooling can be attributed to a reduction in Earth's outgoing radiation during the lockdowns. As human activity slowed down, greenhouse gas emissions and aerosols decreased significantly. This meant less heat was trapped and re-emitted by Earth's atmosphere, resulting in a measurable decrease in the radiation reaching the Moon.

Further, the Moon's surface acts as an amplifier of Earth's radiation signature. And this unique global event provided a rare opportunity to observe how changes in human activity on Earth can affect our nearest celestial neighbour.

While the study presents a compelling correlation, the authors acknowledge that more data is needed to definitively establish the link between Earth's radiation changes and lunar surface temperatures. They suggest that future Moon-based observatories could play a crucial role in studying Earth's climate and environmental shifts.
This unexpected finding highlights the interconnectedness of our solar system and the far-reaching impacts of human activities on our planet. As we continue to grapple with the challenges of climate change, understanding these subtle interactions between Earth and the Moon can provide valuable insights into our planet's complex systems.

(With inputs from TOI)