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What are very old stars that are studied to estimate the age of the universe?
Wiki User
∙ 13y ago
HD 140283 is the oldest star. Lately estimated to be 14.5 billion years old while the universe's calculated age is just 13.8 billion years old.
Of course it's not thought to be older than the universe. There are margins for error in the estimates of its age.
It also nicknamed the Methuselah star because it's the oldest known star.
Wiki User
∙ 8y ago
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How many stars are identified in your milky way galaxy and Andromeda?
We will never have any accurate answer, for several reasons. 1. We're inside the Milky Way, and there is at least a third of it that is hidden from view on the other side of the galactic core. Estimates as to the number of stars in our galaxy ranged up to 400 billion stars, but that was just a guess. 2. In the last year or so, the estimates have more than DOUBLED, because we now think that there are vastly more of the very small and dim "brown dwarf" stars. We now estimate that there may be a TRILLION stars in the Milky Way. 3. Andromeda is a very long way away; the only individual stars that can be seen are the few very brightest stars such as supernovas. But because Andromeda is, we think, even larger than the Milky Way, an estimate of a trillion stars is probably quite reasonable.
How does the sun compare to other stars in terms of surface temperature apparent magnitude absolute magnitude and size?
Our Sun is pretty much average. It's larger than about 60 to 70 % of the other stars in the Milky Way; the estimate increases as we keep discovering more and more very small and very dim brown dwarf "stars" (that are right on the boundary between "star" and "not star").
Why are the stars in the globular clusters classified as population ll stars?
The first stars to form after the "Big Bang" were made just of Hydrogen and Helium. They were very large and died young, exploding to leave a little metal (heavier elements) in the universe - these stars are called "Population III" stars.The next stars to form incorporated a little metal from the older stars (but are still very low in heavy elements) and are called "Population II" stars. Stars in globular clusters are this sort of star (globular clusters are old and have not produced new stars for a long time). We can tell this form their metallicity and the Hertzsprung-Russell diagram for Globular clusters.Most stars contain a lot of heavy elements (high metallicity) and are quite young (like our Sun). These are called "Population I" stars.
How do you calculate the age of the universe?
One method was to determine the age of the oldest stars. Our estimates were around 20 billion years for these. Another was to calculate backwards from the expansion rate, which gave us a value of about 12 billion years. These two disparate numbers were ultimately resolved by very precise measurements made by the COBE satellite, and further enhanced by the subsequent WMAP satellite. We now know the age of our universe to be about 13.8 billion years.
Buzz lightyear thinks his spaceship is very?
is a very tank piece of equipment. he thinks that it can be use for the destruction of the entire universe
Why are red stars important?
There are very many of them so they have to be studied because they are an important class of stars.
How meany galaxies and stars are there in this universe?
In the VISIBLE UNIVERSE, there are somewhere in the order of 1011 galaxies; each galaxy on average has 1011 stars, for a total of (very roughly) 1022 stars.
Are there other stars like your sun in the universe?
Probably MILLIONS of stars very much like our Sun.
What is ten to the twenty-third power?
A very large number. One and one half times ten to the twenty third power is the current estimate of the number of stars in the universe! There are 500 billion stars in our Milky Way galaxy and there are 300 billion galaxies in the universe by the current estimate. If all of the other galaxies are the size of the Milky Way galaxy then the total number of stars is 1.5 times ten to the twenty third power!
How did sundials help people tell time before there were clocks?
When the sundial casts no shadow, it is noon where you are.Then you had to estimate from there, but regulars users got very close with their estimations. They also studied the tides and the stars.
How did sundials help people to tell time before there were clocks?
When the sundial casts no shadow, it is noon where you are.Then you had to estimate from there, but regulars users got very close with their estimations. They also studied the tides and the stars.
A very large group of stars and planets that includes the sun and its solar system?
universe
What is the description of the no boundary universe theory?
It is very easy to answer- First, I want to tell that , what is a universe? A universe is a limitless space with billion of stars in it. So,lets come to the point.There is no boundary in the universe as it is a very vast space and billion of other universe are also there. I wish that you could understand it
What is thev connection between universestar and galaxy?
The universe comprises all matter in space. This includes a very large number (200 billion to 2 trillion) galaxies. Each galaxy comprises a very large number of stars: our contains 100 thousand million stars.
What is cosmology about?
Cosmology is the study of the universe as a whole (as compared to our particular corner of the universe, the planet Earth, which we naturally have studied very closely). Cosmology is concerned with such questions as, how was the universe created and what is its past history, how big is it, what does it contain, how does it evolve, what will it be like in the future.
Is the world as big as the universe?
When we talk about the world, we mean the earth we live on. This world is a small planet revolving around the sun, one of many billions of other suns, or stars, in the universe. So, the world is very, very small compared to the universe.
Is ther life out said the solar system?
It is not currently known. It seems very likely, given the huge amount of stars/planets in the Universe. (There are roughly 1011 galaxies in the observable Universe, with an average of 1011 stars per galaxy; it is now believed that most stars have planets.)
