🌍 Did you know that stars, despite their destructive appearance, actually produce the elements that make up our universe?

Yet, this is just one of the many mysteries surrounding these molten celestial bodies.
Stars are at the origin of numerous myths and beliefs.

In ancient Egypt, the sun was the embodiment of the god Ra, traversing the heavens in his barque, thus creating the day/night cycles.
Among the Incas, Inti was the sun god.
A source of heat and light, protector of the people, he was considered the most important of the deities.

Even the ancient Greeks, though 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—thus governed the lives of the Mediterranean peoples.

Today, our knowledge and observations of the sky have allowed us to learn more about this celestial body.

Initially considered unique, we now know that the sun is just one star among many.

A mere drop in the ocean of celestial bodies, as massive as they are luminous.

And even that is a gross understatement…
According to the latest observations, our Milky Way galaxy contains between 200 and 400 billion stars.

But it too is just one galaxy among the trillions hidden within the observable universe.
Astronomical figures that, upon reflection, can make our heads spin!
Even the most starry sky reveals only a tiny fraction of the stars in the cosmos.
If they were all visible, we would be constantly bathed in blinding light, day and night.

🔥 As a reminder, videos are published on SUNDAYS at 6:00 PM.

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💥 Journey to the Stars of the Cosmos:

• Our sun is far from being the largest star in our galaxy.

And in a way, that's excellent 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 larger, it's very likely that life would never have developed on Earth.

Also, the Sun would have been much more ephemeral.

We know this all too well, because hypermassive stars, with very short lifespans, are hidden in our Milky Way.

They are called: blue giants!

So far, our journey has taken us to stars of many colors.

For stars with a temperature of around 3000 degrees, the dominant color was red.

For stars around 4,000 degrees, orange is the dominant color.
For stars similar to our sun, those with temperatures between 5,000 and 6,000 degrees, their predominant color is yellow.
Even hotter, stars 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 attention, you'll notice that no green stars have been mentioned.

So, where are jade stars hiding?

Most stars form in nurseries.

Within these so-called "molecular" clouds, the brightest stars can emerge, gradually forming complex systems composed of planets, planetoids, and other asteroids.

But not all stars are so lucky… By an unfortunate twist of fate, some stars find themselves isolated, condemned to drift alone through the cosmos.
These stars, called solitary, orphan, or even wandering stars, have piqued the curiosity of scientists.
Is it possible that they formed far from any source of activity, in cold, empty regions?

And if so, how can we explain such a mystery?

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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 aren't there any green stars?

48:41 - The life cycle of a star
58:20 - The death of massive stars: The 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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