Galileo’s drawing of the Pleiades from the Sidereal Messenger (left) and an image from a modern replica of Galileo’s telescope (below). Only the outlined.

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Presentation transcript:

Galileo’s drawing of the Pleiades from the Sidereal Messenger (left) and an image from a modern replica of Galileo’s telescope (below). Only the outlined stars in Galileo’s drawing are visible with the naked eye.

The Planck function for temperatures from 3500 - 5500 K (graphic stolen from wikipedia)

Solar spectrum, shown as through a prism (top) and in a plot of intensity vs. wavelength (side) (images taken from wikipedia)

Spectra for O - G stars (left) and G - M stars (right)

Element abundances in the Solar system (data from Lodders 2003)