How Big is Sun compared to Earth?
The Sun! Our everything. The source of Life and at the same time an ordinary Star in an ordinary Galaxy. But how big is actually? The most easy way to understand the size of the Sun is to compare it … Read More
What is Gravity?
We all know what is Gravity – it is what keeps us down to Earth. It is the force that makes apple to fall next to the tree. But what is the definition of Gravity in physics? It’s one of … Read More
Speed Of Light – How Fast is That?
Perhaps all you have heard at least once the expression “Speed of Light”. If you are from those who know that this is something very fast but do not know how fast actually, I will say that it’s about … Read More