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May 17, 2019

China’s Chang’E-4 may have landed near pieces of the Moon’s interior

Enlarge / The original Yutu rover, shown on the Moon. (credit: NASA)

While some of the details are still being worked out, it’s generally agreed that the Moon formed when a Mars-sized body collided with the early Earth. Some of the debris put into orbit by the collision would then go on to condense into the Moon.

One of the consequences of this is that the early Moon spent a lot of its history being bombarded by this debris, a process that should have left its surface molten. This magma ocean would only solidify slowly as the bombardment wound down, and the process of solidification should have left a mark on the [...]

 
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May 17, 2019

China’s Chang’E-4 may have landed near pieces of the Moon’s interior

Enlarge / The original Yutu rover, shown on the Moon. (credit: NASA)

While some of the details are still being worked out, it’s generally agreed that the Moon formed when a Mars-sized body collided with the early Earth. Some of the debris put into orbit by the collision would then go on to condense into the Moon.

One of the consequences of this is that the early Moon spent a lot of its history being bombarded by this debris, a process that should have left its surface molten. This magma ocean would only solidify slowly as the bombardment wound down, and the process of solidification should have left a mark on the [...]

 
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May 16, 2019

First results from New Horizons’ time in the Kuiper Belt

Enlarge / When Ultima met Thule. A view of the two-lobed body, showing the bright neck and the large Maryland crater. (credit: NASA/Johns Hopkins University APL/Southwest Research Institute.)

For many at the Johns Hopkins Applied Physics Laboratory, January 1 this year didn’t mean a New Year’s celebration. Instead, it meant the first arrival of data from New Horizons’ visit to a small Kuiper Belt object. But, like its earlier flyby of Pluto, the probe was instructed to grab all the data it could and deal with getting it back to Earth later. The full set of everything New Horizons captured won’t be available [...]

 
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April 30, 2019

Impact that formed the Moon might have splashed into Earth’s magma ocean

Enlarge / An early version of the collision model, showing a head-on impact.

The Earth and its moon are unique in our Solar System. Earth is the only rocky planet with a large moon, and only the dwarf planet Pluto has a moon that’s so similar in size to its host planet. The Moon is also remarkably similar to the Earth in terms of its composition, suggesting they formed from the same pool of material instead of the Moon forming elsewhere and having been captured.

This collection of properties led to a number of ideas about how the Moon formed, all of which failed to fit the data in various ways. Eventually, however, [...]

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