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.
9 surprising facts about the Earth 12/3/2016 • Johnny Crepaul
Our home planet, Earth, is truly beautiful and amazing. Here are 9 incredible facts about the third planet from the sun.
The first glasses appeared in Italy at the beginning of the 13th century. Today we use glasses not only as a method of eye vision correction, but also as a fashion accessory. Let's find out more about glasses, their history and the way they work!
The HST is a huge achievement of mankind. It allows us to learn more about outer space and the furthest galaxies. However, do you know something about the telescope that helped to disclose so many secrets about cosmos?
If you agree that keeping the environment clean is important, then you'll like the thing that the Italians came up with. They developed a building consisting of eco-friendly materials that can purify the air.
Is everything you know really true? Can you see the difference between the truth and a lie? If at least 4 of these facts surprise you, we strongly recommend you to be more attentive while learning something new. Well, let's see if any of these will surprise you!