Are people at the South Pole upside down?
- Written by Abigail Bishop, Ph.D. Student in Physics, University of Wisconsin-Madison
After noticing this difference, I remembered something similar in the night skies of New Zealand, a country near Antarctica where my fellow travelers and I got our big red coats[6] that kept us warm at the South Pole. I had looked for Orion, a constellation[7] that in the Northern Hemisphere is viewed as a hunter holding a bow and drawing an arrow from his quiver. In the night sky of New Zealand, Orion looked like he was doing a handstand.
Everything in the sky felt upside down and opposite, compared with what I was used to. A person who lives in the Southern Hemisphere might feel the same about visiting the Arctic or the North Pole.
To understand what’s happening, and why things are really different but also feel very much the same, it might be useful to back up a bit from Earth’s surface. Like into outer space. On space missions to the Moon, astronauts could see one side of the Earth’s sphere at once.
If they had superhero vision, an astronaut would see the people at the South Pole and North Pole standing upside down from each other. And a person at the equator would look like they were sticking straight out the side of the planet. In fact, even though they might be standing on the equator, people in Colombia and Indonesia would also look like they were upside down from each other, because they would be sticking out from opposite sides of the Earth.
Of course, if you asked each person, they would say, “My feet are on the ground, and the sky is up.”
That’s because Earth is essentially a really big ball whose gravitational pull[9] on every one of us points to the center of the planet. The direction that Earth pulls us in is what people call “down” all over the planet. Think about holding a baseball between your pointer fingers. From the perspective of your fingertips on the ball’s surface, both are pointing “down.” But from the perspective of a friend nearby, your fingers are pointing in different directions – though always toward the center of the ball.
These relationships between people on the Earth’s surface are good for a little bit of fun, though. While I was at the South Pole, I pointed my body in the same direction as my friends in Wisconsin – by doing a handstand. But if you look at the picture the other way around, it looks like I’m holding up the entire planet, like Superman[10].
This is the right way up: Abigail Bishop does a handstand at the ceremonial South Pole.
Abigail Bishop
Hello, curious kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to CuriousKidsUS@theconversation.com[11]. Please tell us your name, age and the city where you live.
And since curiosity has no age limit – adults, let us know what you’re wondering, too. We won’t be able to answer every question, but we will do our best.
References
- ^ Curious Kids (theconversation.com)
- ^ CuriousKidsUS@theconversation.com (theconversation.com)
- ^ detectors looking for extremely high energy particles (ara.wipac.wisc.edu)
- ^ The Planetary Society (www.planetary.org)
- ^ CC BY-SA (creativecommons.org)
- ^ big red coats (www.jeffreydonenfeld.com)
- ^ Orion, a constellation (www.britannica.com)
- ^ NASA (explorer1.jpl.nasa.gov)
- ^ gravitational pull (spaceplace.nasa.gov)
- ^ like Superman (screenrant.com)
- ^ CuriousKidsUS@theconversation.com (theconversation.com)
Authors: Abigail Bishop, Ph.D. Student in Physics, University of Wisconsin-Madison
Read more https://theconversation.com/are-people-at-the-south-pole-upside-down-256754
