... Most of the time large telescopes are collecting light for a spectrograph, which spreads the light out into a rainbow. ... Atoms in the cool outer layers of a star absorb light coming from the hotter regions within, producing dark absorption lines across the spectrum. ... And astronomers do not actually use color film to take a color picture of the spectrum, for several reasons: . ... Color film does a very poor job of representing the continuous range of colors in a spectrum. ... Tutorial: Part 1 |...

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... Supernova showered Earth with radioactive debris . ... milky way . ... Famous supernovae still echo across the Milky Way . Astronomers can use these echoes to observe light from old supernovae. ... Astronomers have detected a light echo from this supernova, meaning they can see the light from the explosion itself 400 years later. ... These are the first supernovae light echoes discovered in the Milky Way. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

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