In this explainer, we 're exploring the mystery of Stonehenge. Who built it? Neil deGrasse Tyson and comic co-host Chuck Nice talk about the prehistoric landmark and its ancient connection to the stars. Could it have been made by aliens?

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Learn about StarTalk’s trip to London and adventures at Stonehenge during the summer solstice. What was the purpose behind Stonehenge's intricate construction? Who's responsible for it? Was it druids? Was it aliens from outer space? We explore what Stonehenge was likely used for and learn about the lunar saros. Plus, Neil breaks down the origins of Manhattanhenge.

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About StarTalk:
Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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00:00 - Intro: StarTalk goes to Stonehenge
03:55 - What is Stonehenge?
07:17 - Why is Stonehenge?
8:51 - Manhattanhenge
10:09 - The Lunar Saros Timescale
14:00 - IS IT ALIENS?