Why do stars twinkle? 9/28/2015 • tommy anderson
Imagine a summer warm night and clear sky covered with thousands of blinking star diamonds. Very romantic and beautiful, but do you know why they actually blink? It happens because the Earthly atmosphere is warmed-up inhomogeneously.
Warm and cold air has different density, that's why the deflection angle of the light is also different when it is going through warm or cold atmospheric layers. Airflows are constantly moving and mixing, thus combination of cold and warm layers being always changed. As a result, a star may seem very changeable – first it may be bright and the next moment obscure. Sometimes it may even seem that a star is twitching. When viewed at high magnification a star may seem to change its shape and color.
Stars twinkle a lot right after the sunset, because a great number of warm airflows rise up into the atmosphere from the earthly surface that is warmed-up during the daytime.
Sometimes your eyes deceive you. Can you guess what is pictured in these photos?
Science is the best way to keep kids entertained! By the way, can you explain all of these cool experiments?
How can overweight and obesity be prevented? Learn more about this major problem 10/21/2016 • Diane McKenzie
This educational video throws light on a problem which has become a real global epidemic of our time.
"My name is Tim Doucette. I'm an amateur astronomer. And I'm also legally blind. Kind of an oxymoron, isn't?"
This aricle is for those who think that they saw everything and there is nothing to surprise them. But still nature has broad imagination. Welcome the most fabulous creatures in the world you don't know about!