Binary Theory TwistEnter researchers from Penn State University proposing an alternative: Earth may have captured the moon from a passing binary system—a cosmic duo locked in orbit

Was the Moon captured?

Moon origin theories

Capture theory suggests that the Moon was a wandering body (like an asteroid) that formed elsewhere in the solar system and was captured by Earth’s gravity as it passed nearby. The accretion hypothesis proposes that the Moon was created along with Earth at its formation.

What would have happened if the Moon had been captured by the Earth?

In the capture scenario, the original lunar orbit would have started as an ellipse but, through the effects of tides, been altered. By calculating the tidal changes, the team identify that initial lunar orbit would have contracted over thousands of years, becoming more circular at the same time

What did Galileo say about the Moon?

He soon made his first astronomical discovery. At the time, most scientists believed that the Moon was a smooth sphere, but Galileo discovered that the Moon has mountains, pits, and other features, just like the Earth

What are 5 interesting facts about the Moon?

Back to the Moon

• The Moon’s surface is actually dark. … 
• The Sun and the Moon are not the same size. … 
• The Moon is drifting away from the Earth. … 
• The Moon was made when a rock smashed into Earth. … 
• The Moon makes the Earth move as well as the tides. … 
• The Moon has quakes too. … 
• There is water on the Moon!

What happens to the ocean if there is no moon?

Without the moon, life on Earth would be much different. For example, the planet’s tides would be much weaker. They would still rise and fall because of the gravitational pull of the sun, but would have only about 40 percent of the strength of today’s tide

Over six missions to the Moon, from 1969 to 1972, Apollo astronauts collected more than 360 kg (800 pounds) of lunar rock and soil.

Chemical and isotopic analysis of that material showed that it was similar to the rock and soil on Earth: calcium-rich, basaltic and dating to about 60 million years after the Solar System formed.

Using that data, the planetary scientists who gathered at the Kona Conference in Hawaii in 1984 came to the consensus that the Moon formed from debris after a collision on the young Earth.

“The Kona Conference set the narrative for 40 years,” said Penn State’s Professor Darren Williams.

“But questions still lingered. For example, a moon that forms from a planetary collision, taking shape as debris clumps together in a ring, should orbit above the planet’s equator. Earth’s Moon orbits in a different plane.”

The Moon is more in line with the Sun than it is with the Earth’s equator.”

“In the alternative binary-exchange capture theory. Earth’s gravity separated the binary, snagging one of the objects — the Moon — and making it a satellite that orbits in its current plane.”

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