🌍 Did you know that, beneath their destructive exterior, stars actually produce the elements that make up our universe?
Yet this is just one of the many mysteries that revolve around these molten stars.
The stars are the source of many myths and beliefs.
In ancient Egypt, the sun was the incarnation of the god Ra, crossing the heavens in his bark, creating the day/night cycle.
Among the Incas, Inti was the sun god.
A source of heat and light, and protector of the people, he was considered the most important of all deities.
Even the ancient Greeks, far ahead of their time, considered the god Helios to be the personification of the sun.
He and his sisters - Selene, the moon, and Eos, the dawn - gave rhythm to the lives of the Mediterranean peoples.
Today, our knowledge and observations of the sky have enabled us to learn more about this star.
Initially considered unique, we now know that the sun is just one star among many.
A mere drop of water in an ocean of celestial bodies as massive as they are luminous.
And to say so is an understatement...
According to the latest observations, our Milky Way is home to between 200 and 400 billion stars.
But it, too, is just one galaxy among the trillions hidden in the observable universe.
Astronomical figures that, if you think about it too hard, can make you dizzy!
Even the most starry sky reveals only a tiny fraction of the stars in the cosmos.
If they were all visible, we'd be constantly bathed in blinding light, day and night.




🔥 As a reminder, videos are published on SUNDAYS at 6pm.


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💥 Journey to the stars of the cosmos:
- Our sun is far from the biggest star in our galaxy.
And in a way, that's great news.
Its mass and temperature are ideal for providing us with heat and light for hundreds of millions of years to come.
If it had been bigger, it's very likely that life would never have developed on Earth.
Also, the Sun would have been much more ephemeral.
We know this only too well, because hypermassive, short-lived stars lurk in our Milky Way.
They're called blue giants!

So far, our journey has taken us to stars of many colors.
For stars around 3000 degrees, the main color was red.
For those around 4,000 degrees, orange dominates.
For stars similar to our sun, those with temperatures between 5,000 and 6,000 degrees, their main color is yellow.
Hotter still, stars at around 10,000 degrees are white, or even slightly bluish.
Finally, the hottest stars, over 20,000 degrees, range from light blue to deep blue.
But one color seems to be missing...
If you pay close attention, you'll notice that no green stars are mentioned.
So where are the jade stars hiding?

Most stars are formed in nurseries.
Within these so-called "molecular clouds", the brightest stars are born, gradually forming complex systems of planets, planetoids and asteroids.
But not all stars are so lucky...
By an unfortunate twist of fate, some stars find themselves isolated, condemned to drift alone in the cosmos.
These stars, known as loners, orphans or wanderers, have aroused the curiosity of scientists.
Is it possible that they formed far from any source of activity, in cold, empty zones?
And if so, how can such a mystery be explained?


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🎬 Today's program:
- 00:00 - Introduction
- 03:36 - The different types of stars
- 05:05 - Brown dwarfs
- 11:30 - Red dwarfs
- 17:07 - Yellow dwarfs
- 22:05 - Red giants
- 28:11 - White Dwarfs
- 33:17 - Black dwarfs
- 40:00 - Blue giants
- 44:07 - Why are there no green stars?
- 48:41 - The life cycle of a star
- 58:20 - The death of massive stars: Supernova
- 01:05:28 - Neutron stars
- 01:12:02 - The most surprising stars in the Cosmos!
- 01:12:37 - Vampire stars
- 01:15:55 - Variable stars
- 01:20:36 - Lone stars
- 01:24:24 - What's next?


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