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The way that astronomers learn what elements are present in a given star is by analyzing the light from the star. Different elements have different spectral signatures, and by comparing the light from the stars to the known signatures of the elements, scientists are able to determine which ones are present in the stars.

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9y ago
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14y ago

We identify different elements in stars using spectrography. This is when we analyse the light waves emitted by different elements. Every element in the universe has a "fingerprint" in the absorption spectra they produce and since we can study the different elements on earth, we can then turn our spectrograph to a star and see the different absorption spectra of its component chemicals, which we then compare with known samples to identify the type of element.

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11y ago

The atomic emission spectrum of an element is different from any other element. That is just a characteristic of the elements. The wavelengths of the spectral lines are simply different for each element. I apologize if this answer is not what you wanted but I hope that help!

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10y ago

If you go outside at night and give the stars more than just a quick glance ...

give them two glances, let's say, 15 minutes apart ... you'll see clearly see that

everything in the sky is moving.

The reason is exactly the same as the reason the Sun rises on one side of

the sky, crosses over, and sets on the opposite side. It's simple: The Earth is

spinning ... one complete spin roughly every 24 hours ... and everybody and

everything on the Earth rides along with the spin. When we look at something

that's far away and not on the Earth, the spin keeps turning our eyes and our

telescopes in different directions. If we want to keep watching the same object,

we have to keep turning our eyes and our telescopes in order to stay planted

on it.

That's why you look in different directions to see the Sun as the day goes

on, and that's why you point your telescope in different directions to watch any

single star as the night goes on.

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13y ago

The curved glass lens (or mirror) in a telescope collects the light from a larger area than your eye can, and concentrates it in a viewing area (the eyepiece) that is free from other brighter lights.

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14y ago

It is like having bigger eyes... The bigger a telescope's main lens, or main mirror, the bigger will be (a) its light-gathering capacity, and (b) its resolution. For simplicity, just consider our eyes as a "small telescope", and compare the size.

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12y ago

they identify the elements using absorption spectra. Atoms become electrically charged and the electrons jump up several energy rings. They want to go back to their natural state (original rings) so they drop back down. But where does the energy go? It is released in the form of photons, and leaves the atom. This is seen as plain old white light-not very helpful. But, these can be broken up with a prism, and there is a rainbow (just like with any time light is broken up) except there are bars missing. Each element has certain bars missing when light emitted by the charged gas is broken up by a prism. Thus, scientists break up the light emitted by a star and see which bars are missing and also how bright the rest is. This shows not only what elements are present, but also what percentage of each element the star consists of.

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12y ago

You use spectroscopy. Astronomers use a spectroscope to look at a star and record its spectra pattern, they then compare it to the spectra emitted by known substances, if all of the dark lines of one element and of the star match up, then that star contains that element on its atmosphere.

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13y ago

Because it actually IS a double or multiple star. Also, because the telescope has a better resolution than the human eye - it is capable of distinguishing, as separate points of light, things that are closer together.

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14y ago

telescopes help astronomers by finding new objects in space we have never discovered

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