New Impact Hypothesis Might Explain Our Moon’s Uniqueness

New Impact Hypothesis Might Explain Our Moon’s Uniqueness
New Impact Hypothesis Might Explain Our Moon’s Uniqueness
New Impact Hypothesis Might Explain Our Moon’s Uniqueness
New Impact Hypothesis Might Explain Our Moon’s Uniqueness
New Impact Hypothesis Might Explain Our Moon’s Uniqueness
New Impact Hypothesis Might Explain Our Moon’s Uniqueness
New Impact Hypothesis Might Explain Our Moon’s Uniqueness

New Impact Hypothesis Might Explain Our Moon’s Uniqueness

“This also helps explain some nice oddities all in one go. “What’s beautiful about this work is that we can end up with the current state of the moon — its orbit, its chemistry — with just one step, without invoking any other event,” says Sarah Stewart, a coauthor on the study. If the Earth rotated on its axis before the impact, and if the protoplanet that collided with Earth were in the Earth-Sun plane, none of this would be possible. But with this, we not only get a rapidly spinning young Earth and a 24-hour, 23.5º tilted Earth today, but a Moon that orbits out of the plane, nearly locked to the Sun rotationally, and locked to the Earth revolution-wise. The pieces all fall together beautifully.”

Why is our Moon so unlike every other moon in the Solar System? No other moon is such a large percent of its parent planet’s mass or size; no other moon rotates so far afield of its planet’s rotational axis; no other moon orbits so far out of the planet-Sun plane. Yet our Moon does it all. The giant impact hypothesis might explain why the Moon is made of the same material as Earth, but wouldn’t explain these features. Unless, that is, the giant impact occurred with a very large velocity out of the plane of proto-Earth’s orbit. Unless, again, the Earth weren’t rotating at 23.5º prior to the impact. This new tweak on the impact hypothesis, put forth by a team of authors earlier this week in the journal Nature, might explain the unique history of the Earth-Moon system, including some features we don’t normally think about as being puzzling.

It isn’t just Earth that’s unique in our Solar System, but the Moon as well. Combined, the great cosmic detective story might have a new lead suspect!

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CYGNSS Rockets Into Orbit Atop Pegasus
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Judging from the head design, the statue was carved during the Ming Dynasty (1368-1644), said Xu Changqing, head of the provincial research institute of archaeology.

He said that the researchers had also found rectangular holes carved on the cliff, obvious marks of architecture, which meant that a temple could have existed there. Read more.

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