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Posted by: Lonesome Schneider , source: COSMOS – A Field Guide, Giles Sparrow, 2006

Title: Hertzsprung-Russell Diagram

Hertzsprung-Russell diagram, a graph used by astronomers to illustrate the general properties of large numbers of stars. It compares the luminosity or intrinsic brightness of a star (on the vertical axis) with its colour, spectral type, or surface temperature (along the horizontal axis). Typically blue, high-temperature and highly luminous stars appear at the upper left, while red, low-temperature, dim stars lie towards the lower right.

Source: COSMOS – A Field Guide, Giles Sparrow, 2006

Posted by: Dr.Know , source: The Renaissance, Stefano Zuffi, 2003

Title: Galilei

During the second half of the sixteenth century, literature and art faced the great question of the relationship between human beings and nature. On the threshold of the seventeenth century, the culture of Europe sensed the obvious need to use new means to confront the great, eternal question: is it permissible (and in what way) to explore the mysteries of life, of the cosmos, of the „functioning“ of the universe and the position of humanity within it? Protected by Grand Duke Cosimo II with the title „court philosopher“, Galileo published his Sidereus Nuncius („The Starry Messenger“) in 1610, the first essay of great scientific importance by the famous scholar, who in that same period was perfecting the telescope.

Source: The Renaissance, Stefano Zuffi, 2003

Posted by: Gretel , source: COSMOS – A Field Guide, Giles Sparrow, 2006

Title: Star

A massive ball of hydrogen and helium bound together by gravity and shining for most of its life with the light of nuclear fusion. Stars are born in nebulae and open clusters, and spend most of their lives on the main sequence of the Hertzsprung-Russell diagram, before evolving into red giants, and, depending on their mass, dying as planetary nebulae or supernovae. The stellar remnants they leave behind may be white dwarfs, neutron stars or black holes.

Source: COSMOS – A Field Guide, Giles Sparrow, 2006

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