Erde: Einer von einer Milliarde? Wie selten ist unser Planet? Neue Forschungsergebnisse zeigen, wie statistisch ungewöhnlich die Erde unter den bekannten Exoplaneten ist
https://hive.blog/hive-196387/@kur8/earth-one-in-a-billion
Erde: Einer von einer Milliarde? Wie selten ist unser Planet? Neue Forschungsergebnisse zeigen, wie statistisch ungewöhnlich die Erde unter den bekannten Exoplaneten ist
https://hive.blog/hive-196387/@kur8/earth-one-in-a-billion
5 Kommentare
Right, so on a universal scale, these are great odds. Even on a galactic scale, honestly.
Known exoplanets are known because our detection methods bias large planets around big stars, or small (or large) planets around small stars.
Earthlike worlds around g-class stars are extremely hard to detect.
The[ Rare Earth hypothesis](https://en.wikipedia.org/wiki/Rare_Earth_hypothesis) is not new.
300 Billion stars in OUR Milky way alone.
200+ Million Galaxies in the observable Universe. Each with 200-500 BILLION stars.
Not so rare.
We are only at the very start of being able to detect exoplanets. If you had asked astronomers a few centuries ago how many moons there were in the solar system, they would have said seven to ten, because telescopes at the time were still primitive. Who knows how many more planets we will find once we’re not relying just on wobbling and flickering of distant stars, both of which favour finding big gas giants?
I would also say if there really is one Earth for ever billion planets (or whatever astronomical number is being floated around), that’s still a lot more than people were prepared to estimate when I was a kid. The Milky Way has somewhere between 100 and 400 billion stars. Now I understand not every star has planets, but I think the odds are good that most stars that do have planets probably have more than one planet. Are there more than a hundred Earths out there, even with pessimistic back-of-the-cocktail napkin math? That’s a great number, especially compared to what we were guessing even a few decades ago!