00:00Imagine a universe wrapped in total darkness, a vast silent blackness that stretches on forever.
00:07Then a single point of light ignites, then another, and another. This is the cosmic dawn.
00:14It is the moment the very first stars were born, more than 13 billion years ago.
00:20They were the first lights in an empty cosmos. This ancient light has been traveling through
00:26space ever since. It has been journeying for an almost unimaginable amount of time.
00:32Now that faint old light is reaching us. We are finally able to catch it.
00:37We are finally able to read the story it carries across the ages.
00:42A new tool allows us to see this ancient scene. It is the James Webb Space Telescope,
00:48a time machine of sorts. The James Webb Space Telescope has a very specific job.
00:54It is designed to see the unseen. When we look at the night sky we are seeing visible light.
01:00But visible light is only a tiny part of the full rainbow of light. The JWST sees in infrared light.
01:08You can think of infrared as heat radiation. Even very cold objects in deep space glow faintly
01:14in the infrared. The universe is expanding. As it expands, it stretches the light that
01:21travels through it. Light from the first stars started as visible or ultraviolet light. But its
01:27long journey has stretched it into the infrared spectrum. So when JWST stares at a seemingly empty
01:34patch, it looks for what was there billions of years ago. The infrared light it gathers is a fossil.
01:42An echo of a young universe. But how do we get a message from this ancient light? The light itself
01:49is the message. Spread into a spectrum. It shows chemical signatures called spectral lines. The first
01:57stars were giants. They were monsters of hydrogen and helium. Hundreds of times the mass of our sun.
02:05Inside their blazing cores, nuclear fusion began. Hydrogen fused into helium. Helium into carbon.
02:13The periodic table building step by step. Stellar cores are cosmic forges, hammering oxygen,
02:21nitrogen, even iron, into being. These stars lived fast and died young. Their cores collapsed and
02:28rebounded in spectacular supernovae. A single supernova can briefly outshine an entire
02:34galaxy. In that violence even heavier elements like gold and uranium are forged. The blast hurls carbon,
02:42oxygen, iron and countless other atoms into space. They spread like dandelion seeds on a cosmic wind.
02:49Over eons enriched clouds mixed, collapsed and formed new stars and planets. Our solar system was born
02:57from recycled star stuff. Secondhand material that became earth. This is how heavy elements forged in fire
03:06reached our corner of the universe. About 4.6 billion years ago, a rich cloud collapsed into a spinning disk.
03:13Dust stuck to dust, pebbles to rocks, rocks to planetesimals, the seeds of planets. Through accretion,
03:21the rocky worlds including earth took shape. Earth is not primordial hydrogen and helium. It is almost
03:27entirely star-cooked elements. Rock and soil are minerals. Combinations of stellar elements. Earth's
03:35iron core, quartz in the crust, starlight forged them all. The calcium in limestone and the carbon in coal
03:43are stellar leftovers. Our planet is a giant ball of recycled stardust. On young earth,
03:50these elements mixed in oceans and air. They became ingredients for life, assembled by the first
03:56microbes. Carbon formed life's backbone. Oxygen and hydrogen made water. Nitrogen built DNA and proteins.
04:05Life did not invent new materials. It used what stars had made. This brings the connection to us.
04:13The calcium in your bones, the iron in your blood, the carbon in your cells, all forged in stars.
04:21JWST lets us see the beginning of this story with astonishing clarity. It shows chemical signatures
04:27of oxygen and carbon in galaxies over 13 billion light-years away. We are seeing the first seeds
04:33being scattered, and then we look closer to home. Set the evidence side by side. The spectra match.
04:40The elements are the same. The connection is direct. The cosmic dawn is not distant. Its light is
04:47striking JWST's mirror today. And its products are flowing through your veins. Every sip of water is
04:55oxygen and hydrogen. Hydrogen from the Big Bang. Oxygen forged in stars. Every leafy green carries
05:03iron a star made before it died. This shared origin connects every one of us, to each other, and to
05:10the
05:10night sky. It links us to the most distant galaxies, the oldest stars. Silent atoms, created in fire and
05:18scattered by explosions, have come together here. They organized into rocks, oceans, plants, animals,
05:25and in us, into a consciousness that can look back and understand.
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