- Scientists have said that they have made a
significant progress in solving the mystery behind Moon’s formation after the detailed
survey of the far side of the moon made by China’s Chang’e-4. The study has
been published in the journal Nature.
- Earlier in 2019, China had achieved a milestone
after its spacecraft Chang’e-4 (named after the moon goddess in Chinese
mythology) made first-ever soft landing on the far side of the moon. Chang’e 4
lander deployed the rover Yutu-2 in Von Karmen Crater in the Aitken Basin at
the moon’s South Pole.
- The far side of the Moon is the hemisphere of
the Moon that always faces away from Earth. The far side’s terrain is rugged
with a multitude of impact craters. The near side of the moon is the one which
face the Earth. This is because the tidal forces from Earth have slowed down
the Moon’s rotation to the point where the same side is always facing the
Earth. This phenomenon is called tidal locking
- Previous research suggested that the moon was
covered with an ocean of magma up to hundreds of miles deep when it was newly
formed and still hot from its creation. As this magma ocean cooled and
solidified, denser minerals rich in iron and magnesium, such as olivine, sank
to the bottom of the magma-ocean. On the other hand, lighter minerals rich in
silicon and aluminum, such as plagioclase gathered near the surface. The theory
is popularly known as the lunar magma ocean theory.
- Yutu-2 discovered minerals that appeared
markedly different from typical lunar surface material, which were likely
excavated from below the South Pole-Aitken Basin floor. Materials such as
olivine and low-calcium pyroxene that are rare elsewhere on the surface have
been detected.
- According to researchers, these materials were
ejected from the moon’s upper mantle when it was struck by a meteor. The
researchers have claimed that the study support the lunar magma ocean theory,
and demonstrate that the magma ocean hypothesis can be used to describe the
early evolution history of the moon.
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