Explain how can we determine what stars are made out of by observing their spectral lines

& Explanation:

From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving. We can learn about winds in stars from this.

the game was released on september 15, 2015 for microsoft windows and os x, and on july 17, 2016 for linux. fox expressed interest in releasing undertale on other platforms, but was initially unable to port it to nintendo platforms without reprogramming the game due to the engine's lack of support for these platforms.