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00:40From the primordial cloud of gas and cosmic dust, gravity forged the stars.
01:06Gravity connects star systems together in vast galaxies and steers them on their journey
01:15through unbounded space.
01:23The relentless flow of time has driven the evolution of the universe and created extraordinary
01:30wonders.
01:43Some galaxies form so close together that they're locked in a gravitational embrace.
02:06What a magnificent sight it would be.
02:11What a magnificent sight it would be.
02:11What a magnificent sight it would be.
02:37As it evolves, the universe passes through distinct eras.
02:44Vast ages whose beginnings and endings are marked by unique milestones.
02:52The births and deaths of its wonders.
03:01We are the product of a grand evolutionary sequence, cosmic evolution, about which we are only
03:10occasionally aware of.
03:11What a magnificent sight it would be.
03:19Gravity is the great creator.
03:23The constructor of worlds.
03:25What a magnificent sight is.
03:28What a magnificent sight it would be.
03:29But gravity is also the destroyer.
03:33Because it's relentless.
03:38When a star around 15 times the mass of our Sun collapses.
03:43All the matter in its core is crushed into an infinite void of blackness known as a stellar mass black
03:51hole.
04:05The immense gravitational pull of these monsters can rip a star apart.
04:15They tear matter from its surface and drag it into orbit.
04:26This superheated matter spins around the mouth of the black hole and great jets of radiation fire from the core.
04:40Although these jets can be seen across the cosmos, the core itself remains a mystery.
04:49Not even light can escape, so their interior is forever hidden from us.
05:01Throughout a star's life, there is a constant battle between energy pushing out and gravity pushing in.
05:09When it runs out of fuel, the star collapses and then explodes with the brightness of a billion suns.
05:36As the star is torn apart, it will fire out into space all the elements that it created in its
05:44life and death.
05:49These are new stars forming from the elements blown out by supernova explosions.
05:57New stars being born from the remains of dead ones.
06:04And it's from this universal process of death and rebirth that we emerged.
06:12Because it was in a nebula just like this five billion years ago that our sun was formed.
06:27Clouds of hydrogen collapse further and further under the force of gravity and the life cycle of a new star
06:34has begun.
06:37A star was born that would come to be known as the sun.
06:52Around it, a network of planets formed.
06:56Among them was the earth.
07:07Debris left over from the formation of the solar system collides with the earth.
07:27The earth began life as a molten hell.
07:32The early continents were still forming.
07:37The land was dominated by volcanoes.
07:42Hostile and lifeless.
07:47But deep in the oceans, life had begun.
08:01The latest theory is that chemicals spewing from underwater volcanic vents solidified and created the conditions needed for the first
08:10cells to float.
08:25For some three billion years, simple microscopic organisms were the most advanced form of life on the planet.
08:39Cyanobacteria and other oxygen producing microbes began to bloom.
08:44These flourished in colonies of plant-like microbes that pumped out enormous volumes of oxygen.
08:59And it was this increase in oxygen that was the key to the rise of the animal kingdom.
09:17Organisms started using oxygen to respire.
09:22Yielding a lot more energy, which allowed the development of more complex life.
09:37Just before complex life appeared, the world was in the grip of the biggest ice age in its entire history.
09:57And then suddenly, advanced organisms appeared.
10:04satisfying as a world that� ache was a member of all of these expansions of energy.
10:31You may have seen some of a female base in the
