How Many Exoplanets have we discovered?
Billions of stars, red, yellow, orange, blue, and white, shine in space at distances measured in millions of billions of kilometers, thousands of times farther than the most distant planet in our solar system…
There is no doubt that since the beginning of conscious thought, mankind has sought to understand the universe. Today, astronomers, armed with evidence of the existence of planets around other stars, are asking more specifically: what are these planets like? Of the 100 billion stars in our galaxy, the Milky Way,
how many host planets? And among those planets, how many are just dry deserts or icy spheres of hydrogen? Are any of them home to lush forests or oceans teeming with life?
Today, for the first time in history, astronomers can begin to answer these questions.
It was in 1995 that two astronomers, Michael Mayor, and Didier Queloz, discovered the first extrasolar planet, 51 Pegasi b, around the star 51 Pegasi: a gas giant planet with Jupiter-like dimensions orbiting a sun-like star.
To date, more than 5,000 exoplanets have been discovered, and the number continues to grow. The refinement of observational methods and the development of dedicated spacecraft missions make the search for exoplanets – especially those that might have favorable conditions for harboring life – one of the most exciting topics in astronomy.

But how do we detect these planets? What is their composition? What instruments and spacecraft missions are planned for the coming decades? And finally, will it be possible to find other habitable planets?
The purpose of this video is to answer some of these questions, but mostly to invite you to reflect on the incredible and mysterious beauty that surrounds us.

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