The evidence comes in the form of isotopes of noble gases like helium and neon.
Researchers found these trapped in lunar meteorites recovered from the Antarctic. The isotopes match up with those found in solar wind, despite the meteorites reportedly never being exposed to it.
Thankfully, pieces of the Moon often make their way to us like meteorites.And, because the samples were from an area that never would have been exposed to the solar winds
When digging deeper, the team found sub-millimeter glass particles in the basalt, which retained the isotopic signatures like little time capsules from eons ago.