A Moment of Science

Posts tagged light

June 28, 2012

 

salt lake city pollution seen from park city

What Is Light Pollution?

The magnificent sight of the Milky Way, for example, can now only be seen in rural areas. Why do we shine light up into the sky in the first place?

May 2, 2012

 

stars moving around the pole

Why Do Stars Twinkle?

If you've ever glanced skyward, you've probably noticed the sheer numbers of stars. Some are tiny, barely visible points. Others radiate strong white light.

April 3, 2012

 

a journal with a latin palindrome and the words

Getting It Backwards

Why are letters reversed in a mirror? Try this experiment with pen and paper.

April 2, 2012

 

a baby looking in the mirror

Reflection

You may notice in a mirror that words are backwards in the reflection, but it's actually more than words that are reversed; it's everything!

February 22, 2012

 

xerox photocopy machine

How Do Photocopying Machines Work?

Photocopying machines are fairly complicated devices, but the basic principal is pretty simple.

January 27, 2012

 

man underwater

The Blurry World Underwater

Why can't we landlubbers focus underwater without goggles?

January 26, 2012

 

blue sky with clouds

Why The Sky Is Not Blue

This is partly due to pollution, but even in the cleanest air the sky is lighter near the horizon due to the effect of earth's atmosphere on sunlight.

January 2, 2012

 

plane overhead

Why Is It So Difficult To Spot A Plane In The Air?

How many times have you heard a jet plane going over but not been able to find it even though you were looking toward where the sound was coming from?

November 16, 2011

 

flash

Flash!

Are you familiar with the study done by Wolfgang Miltner at Friedrich Schiller University in Germany?

October 31, 2011

 

a hand holding a yellow highlighter

Seeing Yellow

Why is yellow still the most popular highlighter color?

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