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Home Q & A Board Science-Related Homework Help Physics Astronomy
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James89 James89
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6 years ago
The coolest white-dwarf:  Surveys have been carried out to identify isolated white-dwarfs throughout the galaxy and its globular clusters. They have been found to span a range of temperatures, with a sharp lower limit of about 3000 K (i.e. many have been found at all temperatures from 10s of thousands of Kelvin down to 3000K, but none cooler).  What does this observation reveal about the age of our galaxy?
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The Essential Cosmic Perspective

The Essential Cosmic Perspective


Edition: 7th
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#1
6 years ago
 The galaxy has a finite age, when enough gas must have become present to generate stars which could go on to become white dwarfs. (This observation is one of the supporting pieces of evidence for the approximately 13 billion year age of the universe  the coolest observed white dwarfs are about 10 billion years old)
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