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re: Astronomers spot one of the oldest stars in the entire universe
Posted on 11/8/18 at 5:52 pm to DavidTheGnome
Posted on 11/8/18 at 5:52 pm to DavidTheGnome
I honestly dont believe a single word of that. Those frickers are making all of that shite up.
0
Posted on 11/8/18 at 5:52 pm to DavidTheGnome
I guess I deserved that
Posted on 11/8/18 at 5:56 pm to Tester1216
quote:
How do they date stars?
eStarmony.com
Posted on 11/8/18 at 6:01 pm to SlapahoeTribe
Haha good one.
Now answer my question please
Now answer my question please
Posted on 11/8/18 at 6:07 pm to Tester1216
LINK
"Astronomers usually cannot tell the age of an individual star. There are certain stars that we know are very young, and others that are very old, but for most stars we cannot tell. When we have a large group of stars, however, we can tell its age. This is possible because all of the stars in a cluster are presumed to have begun their life at approximately the same time. After a relatively brief time (in 'star time,' that is--we are talking thousands to millions of years here) stars reach the adult phase of their life, which we call the main sequence phase. The length of time a star spends in the main sequence phase depends on its mass.
"Constructing a plot, called the HR diagram, of the stars in the cluster, scientists can determine the mass of the stars that are just ending this phase and moving on to the next phase of their life, the red giant phase. Computer models allow us to predict how old a star of that mass must be to be at that juncture of its life, and hence to estimate the age of the cluster. Recently, this procedure has come under close scrutiny because that age it gives for the oldest star clusters in our Milky Way seems to be older than the age of the universe derived from the most recent Hubble Space Telescope data."
"Astronomers usually cannot tell the age of an individual star. There are certain stars that we know are very young, and others that are very old, but for most stars we cannot tell. When we have a large group of stars, however, we can tell its age. This is possible because all of the stars in a cluster are presumed to have begun their life at approximately the same time. After a relatively brief time (in 'star time,' that is--we are talking thousands to millions of years here) stars reach the adult phase of their life, which we call the main sequence phase. The length of time a star spends in the main sequence phase depends on its mass.
"Constructing a plot, called the HR diagram, of the stars in the cluster, scientists can determine the mass of the stars that are just ending this phase and moving on to the next phase of their life, the red giant phase. Computer models allow us to predict how old a star of that mass must be to be at that juncture of its life, and hence to estimate the age of the cluster. Recently, this procedure has come under close scrutiny because that age it gives for the oldest star clusters in our Milky Way seems to be older than the age of the universe derived from the most recent Hubble Space Telescope data."
Posted on 11/8/18 at 6:11 pm to DavidTheGnome
Your Momma !
Posted on 11/8/18 at 6:12 pm to AUstar
Thanks for the visual. I still have no idea WTF is going on, but I appreciate the attempt to educate me.
Posted on 11/8/18 at 6:14 pm to DavidTheGnome
quote:
After a relatively brief time (in 'star time,' that is--we are talking thousands to millions of years here) stars reach the adult phase of their life, which we call the main sequence phase. The length of time a star spends in the main sequence phase depends on its mass. "Constructing a plot, called the HR diagram, of the stars in the cluster, scientists can determine the mass of the stars that are just ending this phase and moving on to the next phase of their life, the red giant phase. Computer models allow us to predict how old a star of that mass must be to be at that juncture of its life, and hence to estimate the age of the cluster. Recently, this procedure has come under close scrutiny because that age it gives for the oldest star clusters in our Milky Way seems to be older than the age of the universe deriv
So they really don’t know and if this is the case how can we truly date the approximate time of the Bog Bang? Is it possible that stars have their own lifespan and ages differently given where they are and what energy they’re around?
Just food for thought.
This post was edited on 11/8/18 at 6:15 pm
Posted on 11/8/18 at 6:14 pm to DavidTheGnome
102 years old - Olivia de Havilland
Posted on 11/8/18 at 6:14 pm to Tester1216
They look at the star’s composition by looking at the light it produces (like looking at light through a prism - the different elements burning in the star produce different frequency lines), it’s size, brightness, and distance. Get all of those factors and you can determine the age of a star based on how it is acting now.
Posted on 11/8/18 at 6:17 pm to Tester1216
quote:
they really don’t know and if this is the case how can we truly date the approximate time of the Bog Bang?
That date comes from a different set of data-
Posted on 11/8/18 at 6:18 pm to SlapahoeTribe
But what’s the comparison?
What star that they used to determine this theory?
What star that they used to determine this theory?
Posted on 11/8/18 at 6:19 pm to SlapahoeTribe
But is it not all dependent on each other?
Posted on 11/8/18 at 6:24 pm to Tester1216
We’ve got models of how things should work. And those models are quite good at aligning with the different stars we see.
We can’t sit down and watch one star for a few billion years, so we have to look at different stars and see if those stars are behaving as predicted by our models.
The models are built largely upon our understanding of nuclear physics, gravity, etc.... things we can experiment on.
We can’t sit down and watch one star for a few billion years, so we have to look at different stars and see if those stars are behaving as predicted by our models.
The models are built largely upon our understanding of nuclear physics, gravity, etc.... things we can experiment on.
Posted on 11/8/18 at 6:28 pm to Tester1216
quote:
not all dependent on each other?
Not really. Most of our research on the age of the universe is centered around either the cosmic microwave background, or the understanding of the expansion of the universe as it is doing now (and just running the formulas backwards). The measurements of the expansion of the universe is a whole other animal.
Posted on 11/8/18 at 6:37 pm to SlapahoeTribe
You sound smart 
Well that makes sense. All of that stuff is so interesting to me. Really hard to wrap my head around at times.
Well that makes sense. All of that stuff is so interesting to me. Really hard to wrap my head around at times.
Posted on 11/8/18 at 6:41 pm to Tester1216
BS in Physics
But deciding to go back to school in my mid-30s really has me questioning my intelligence.
But deciding to go back to school in my mid-30s really has me questioning my intelligence.
Posted on 11/8/18 at 6:42 pm to SlapahoeTribe
quote:
But deciding to go back to school in my mid-30s really has me questioning my intelligence.
Well that took discipline for sure.
Do you like magnets? I’m obsessed how they work.
This post was edited on 11/8/18 at 6:43 pm
Posted on 11/8/18 at 6:43 pm to Tester1216
Check out the Deep Sky Videos channel on YouTube. Also Sixty Symbols. And Numberphile if you’re really feeling nerdy.
Posted on 11/8/18 at 6:44 pm to SlapahoeTribe
Will do, thanks!
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