How Big is Sun compared to Earth?

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  to something we know. Our home Planet – The Earth will do a wonderful job. But first let’s look up a bit of digits. The Sun is a star at the center of the solar system. It represents almost a perfect sphere made up of hot plasma and magnetic fields. Its diameter is about 1 392 000 km, nearly...
What is Gravity?

What is Gravity?

We all know what is Gravity – it is what keeps us down to Earth. It is the thing that makes apple to fall next to the tree. But what is the definition of Gravity in physics?  It’s one of the fundamental interactions in the Universe. Fundamental interactions in physics are four completely different in nature interactions between elementary particles and bodies that they build. Many efforts in modern physics are focused at finding a common unified theory that would unite all interactions. So far, such a theory is not found. Here they are: Gravitational interaction Electromagnetic interaction Strong nuclear...
Speed Of Light

Speed Of Light

      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 much actually, I will say that it’s about 300000 km/sec or  670,616,629 mph (miles per hour) and that is the speed of the photon – the only particle with no mass, and will add that there is nothing faster than it. In fact, because we see thanks to photons that pass through our eyes,  if their speed was much more slower we would see everything around behindhand. It sounds...