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Posts tagged magnetic field

July 2, 2013

 

salmon swimming in the river

Salmon Have An Internal Compass

Sockeye salmon are sensitive to Earth's magnetic pull. Scientists discovered that salmon use a trick called "geomagnetic imprinting" to find their way home.

August 30, 2012

 

a bar magnet surrounded by small compasses

Make Your Own Compass

Learn this old sailing trick and find your way back to shore!

February 24, 2012

 

supernova in spiral

Get Ready For A New Type Of Supernova!

Supernovas explode with a bright burst of radiation, giving off as much energy in a few days as our sun will give off in its entire lifetime.

April 5, 2010

 

sunspots_067

From Galileo To Modern Times, What Do We Know About Sunspots?

Have you ever seen pictures of the sun and wondered what those dark spots were? They're sunspots!

January 22, 2007

 

a CT scan of a persons skull in front of a light

Scans, Scans, and More Scans

MRI, CT, PET... What are all these scans used for and how are they different?

January 15, 2007

 

an image of the sun with a sunspot

Backwards Sunspot

What is a backwards sunspot and what does it signify?

December 6, 2005

 

When North Goes South

On a previous show we discussed how, every 250,000 years or so, the north and south poles switch places. Not that the places themselves move, rather, the entire magnetic field of the earth flips around, resulting in the pole we now call north being on the southern tip of the planet, and vice versa. Why does this happen? Learn more on this Moment of Science.

November 28, 2005

 

When North Was South

You’re a polar explorer and you’ve just reached the north pole. The huskies are yapping, the cameras are ready and you’re just about to unfurl the flag when, all of a sudden, the north pole becomes the south pole. Imagine your chagrin. Okay, so it doesn’t really happen that fast, but it’s true that in the past the earth’s magnetic poles have switched places. In fact, it seems to happen roughly every 250,000 years or so. How do we know this? Learn more on this Moment of Science.

May 4, 2004

 

The Biggest Magnet Ever

What's the biggest magnet ever? Find out on this Moment of Science.

September 27, 2003

 

Butterflies and Their Magnetic Compasses

Millions of monarch butterflies fly southwest from eastern Canada and the United States down to Mexico each autumn; then millions more fly back to the northeast in the spring.The one-way trip is as long as 2500 miles for some of these creatures.

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