How we do know that time moves one way and not another? What physical laws of our universe define what time even is and why we don't have...

A typical star is at war with itself since birth, two internal forces; gravity and fusion fighting for control but reaching an...

Gravity; It pulls you to the ground and makes sure you don't fly off It is the reason why things fall down There is no gravity in space...

That dot was our universe. Imagine EVERYTHING you have ever known was once crammed into a space a few millimeters across. BUT HOW?? For...