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.
Barrier Reef is a 1,400 miles long living structure visible even from space. Now, at the age of 25 million years, the Reef is bleaching, which can lead to its death very soon. Let's find out more about one of the most incredible creations of nature and the ways to save it.
9 surprising facts about the Earth 12/3/2016 • Johnny Crepaul
Our home planet, Earth, is truly beautiful and amazing. Here are 10 incredible facts about the third planet from the sun.
As it turned out, some scientists believe we now owe our intelligence (or lack of it) only to our mothers. Let's find out more about this recent research together.
Many people today are obsessed with not dying and living as long as they can. As it turned out, our lifespan may have already hit its natural limit!
Sometimes your eyes deceive you. Can you guess what is pictured in these photos?