by VictorBorun » Fri Jul 12, 2024 12:57 am
Ann wrote: ↑Thu Jul 11, 2024 5:23 pm
Chris Peterson wrote: ↑Thu Jul 11, 2024 4:31 pm
Ham Todd wrote: ↑Thu Jul 11, 2024 4:00 pm
I often wonder what the sky would look like for a person living on a planet that orbited around a star in this cluster! I'm pretty sure the view would be awesome!
Except it's not likely that many stars in a globular cluster have planets.
The view from inside a rich globular cluster might be something like this:
Inside 47 Tucanae William Harris and Jeremy Webb.png
Inside globular cluster 47 Tucanae. Illustration:
William Harris and Jeremy Webb
But Chris is right that there is not likely to be a lot of planets in 47 Tucanae. Or, more precisely, there is not likely to be many planets in well-ordered, near-circular orbits around their stars, in the way that most of the planets in our own solar orbit the Sun. In 47 Tuc, many planets are likely to be torn away from their suns due to tidal interactions with so many other stars passing by all too nearby.
Those planets that remain in orbit around their stars in 47 Tuc may have extremely elongated orbits, which would severely diminish the chances for life to get a foothold there.
Ann
what do we know of life and kinds of life from Earth's history?
1) to emerge in any form using DNA it needed no more than 0.3 billion years.
As soon as heavy bombardment of the early Solar system stopped at year 700 million after Sun formed and the planets' surfaces were no longer melted now and then, our DNA genetic ancestors came to be. (I think if other DNA+protein creatures came to be earlier still, the heavy bombardment melted them away, the genes and all)
2) mass extinction events from hot/cold/chemical changes never stopped all the life
3) some or every one of those catastrophes accelerated evolutionary steps on the ladder of complex adaptation mechanisms up to rational thinking humans
So we do not know if a planet of difficult fate, going rogue iceball and then low-periastron hotball, is left sterile or get intelligent life in 1 billion years instead of Earth's 4.
[quote=Ann post_id=340182 time=1720718638 user_id=129702]
[quote="Chris Peterson" post_id=340181 time=1720715473 user_id=117706]
[quote="Ham Todd" post_id=340180 time=1720713617]
I often wonder what the sky would look like for a person living on a planet that orbited around a star in this cluster! I'm pretty sure the view would be awesome!
[/quote]
Except it's not likely that many stars in a globular cluster have planets.
[/quote]
The view from inside a rich globular cluster might be something like this:
[float=left]Inside 47 Tucanae William Harris and Jeremy Webb.png[c][size=85][color=#0040FF]Inside globular cluster 47 Tucanae. Illustration:
William Harris and Jeremy Webb[/color][/size][/c][/float]
[clear][/clear]
But Chris is right that there is not likely to be a lot of planets in 47 Tucanae. Or, more precisely, there is not likely to be many planets in well-ordered, near-circular orbits around their stars, in the way that most of the planets in our own solar orbit the Sun. In 47 Tuc, many planets are likely to be torn away from their suns due to tidal interactions with so many other stars passing by all too nearby.
Those planets that remain in orbit around their stars in 47 Tuc may have extremely elongated orbits, which would severely diminish the chances for life to get a foothold there.
Ann
[/quote]
what do we know of life and kinds of life from Earth's history?
1) to emerge in any form using DNA it needed no more than 0.3 billion years. [url=https://bigthink.com/starts-with-a-bang/complete-picture-planets-form]As soon as heavy bombardment of the early Solar system stopped at year 700 million after Sun formed and the planets' surfaces were no longer melted now and then, our DNA genetic ancestors came to be.[/url] (I think if other DNA+protein creatures came to be earlier still, the heavy bombardment melted them away, the genes and all)
2) mass extinction events from hot/cold/chemical changes never stopped all the life
3) some or every one of those catastrophes accelerated evolutionary steps on the ladder of complex adaptation mechanisms up to rational thinking humans
So we do not know if a planet of difficult fate, going rogue iceball and then low-periastron hotball, is left sterile or get intelligent life in 1 billion years instead of Earth's 4.