how can scientist find out what gases are in a star or nebulae from?

Answer 1

Spectroscopy is the general answer, but as Nunoyvgvna Awi implies it is not as simple as looking at the color of the spectrum. The actual colors can be modified by the motion of the stars (red shift, blue shift, like the doppler effect for sound). However, elements give off multiple spectral lines (colors) that maintain their relationship even when filtered through other materials and even when modified by red or blue shift. This way the components can be analyzed accurately.

Answer 2

They use a spectrometer, an instrument that takes the bright white light coming from the star and breaks it up into the individual colors of the spectrum. Different gases filter out certain colors and so on.

Answer 3

different gases produce different spectrum patterns. when the light is broken down into it's respective colors, scientists can then determine what gases are in said stars or nebulae.

Answer 4

By observing the light that the star or nebulae produces...

Answer 5

astro is right, for I use to study it as well. but there is a HUGE flaw in the science they care for you not to know.

sure they measure the light to see what its made of, for color tells us this. but think of the millions and billions of miles of space and other chemicals it came through. in turn, changing what the star is actually giving off.

flawed science, yet so many don't see the flip side of the coin.

now the same science used on earth, is fine, or any close distance where we can create a pure vacuum or at least control the variables. we cannot control millions/billions of miles, tails of comments, asteroids, planet releases, sun spots from other suns, etc.

Answer 6

They examine the light that comes from the star (its spectrum).

Which is called Spectroscopy

Answer 7

by a spectrum analysis

Answer 8

spectrometers
I am a drunk