Light reflecting off surfaces at both poles was found to have the spectral signature for the mineral hematitemore commonly known as rust.

Hematite, a type of iron oxide, is formed when iron is exposed to oxygen and water.

The study’s lead author, Shuai Li from the University of Hawaii, called itvery puzzling” as “the moon is a terrible environment for hematite to form inbecause it is airless with no oxygen or liquid water.

He contacted scientists at NASA’s Jet Propulsion Laboratory (JPL) – the department that built Chandrayaan-1’s Moon Mineralogy Mapper instrument.

Abigail Fraeman, a JPL scientist, said: “At first, I totally didn’t believe it. It shouldn’t exist based on the conditions present on the moon.

“But since we discovered water on the moon, people have been speculating that there could be a greater variety of minerals than we realise if that water had reacted with rocks.

Firstly, that despite the moon not having an atmosphere, it does contain trace amounts of oxygenwhich travels 239,000 miles from Earth’s magnetic field.

This explains why more hematite is found on the side of the moon facing Earth and suggests our planet may be the driving force for the rust.

It is also possible the oxygen travelled from Earth to the moon when the two were closer, as they have been moving apart for billions of years.

The second reason could be the level of hydrogen presentthis is delivered to the moon and Earth via solar winds from the sun.

The Earth’s magnetic field protects the planet from solar winds, it also blocks over 99% of this activity during periods of the moon’s orbitparticularly when the moon is full.

This means there is an opportunity during the lunar cycle where rust has the ability to form.

The third explanation suggests that water moleculesfound within the moon’s surfaceare released when dust particles hit the moon, mixing them with iron.

They also suggest the dust particles themselves may contain water molecules which then mix with iron.

At specific times, the moon is shielded from solar winds that carry hydrogen, this paired with the presence of oxygen could cause a rust-inducing chemical reaction.

Dr Fraeman suggested these reasons could also explain why rust is found on other airless bodies, such as asteroids.

JPL scientist Vivian Sun added: “I think these results indicate that there are more complex chemical processes happening in our solar system than have been previously recognised.

We can understand them better by sending future missions to the Moon to test these hypotheses.

© 2020 Sky UK


World news – GB – Rust discovered on the moon – and Earth could be responsible

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