The Big Bang : The birth of everything

The Universe Is everything that we can ever know - all of space and all of time. It is almost entirely empty, with small clusters of matter and energy. The Universe is about 15 billion years old, but estimates vary. The Big Bang explosion is how scientists think the Universe began 15 billion years ago.

The Universe after the Big Bang. Although the Big Bang took place in just a fraction of a second, the explosion was strong enough to send energy and matter flying out at great speed in all directions. No one is able to explain yet what might, if anything, have come before the Big Bang.

Amazing!
Scientists believe that because both space and time began with the Big Bang. there may possibly be no time 'before" it occurred.

Hot ball
Scientists have calculated that the hot ball before the Big Bang must have swelled at a much faster rate than even the speed of light. The hot ball would have grown to the size of a galaxy within a fraction of a second.

The Universe is expanding, with all the galaxies rushing away from each other. Astronomers do not know if this will go on forever, if it sops, and the Universe starts to contract, the galaxies would rush towards each other. Then the Universe might end in a Big Crunch, the opposite of the Big Bang.  This might set off another Big Bang and a brand new Universe.