Understanding the human body is a team effort. That's where the Yachtel group comes in.

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To learn more about Yachtolt, visit yawcult.co.

.jp. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacolt.

This is Scientific American's 60-second science. I'm Christopher in Taliatta.

The sun exerts an enormous and obvious influence on the Earth,

with its gravity and its light.

But other bodies also have a small say in our affairs.

We're not alone in the solar system, other planets.

Dennis Kent, a geologist at Rutgers University

and Columbia's Lamont-Dowardy Earth

Observatory. And as we circle the sun, those other planets and also our moon exert effects on our orbit.

In fact, planetary scientists have long hypothesized that Venus and Jupiter squeeze the Earth's

orbit from circular to elliptical and back every 405,000 years.

During an elliptical orbit, when the distance from the sun varies more,

the differences between the seasons would be more extreme than when the orbit is virtually circular.

Problem is, it's been hard to verify that this oscillation between orbit shapes exists.

But Kent and his colleagues came up with a way, by boring down into the Earth.

They took a rock core from the East Coast, which has excellent sediment records, good evidence

of extreme seasonal variations.

They compared that core with another from Arizona, embedded with zircons.

...