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Encyclopedia > I Zwicky 18

I Zwicky 18 is a galaxy 45 million light years away. It is named after Swiss astronomer Fritz Zwicky, who first photographed it in the 1930s.

I Zwicky 18 is 500 million years old, which makes it practically an infant (by comparison, most galaxies, including our own Milky Way, are approximately 12 billion years old). It may still be creating Population III stars - spectroscopy shows that its stars are composed almost entirely of hydrogen and helium, with heavier elements almost completely absent.

External link

  • Hubble Uncovers a Baby Galaxy in a Grown-Up Universe (http://hubblesite.org/newscenter/newsdesk/archive/releases/2004/35/text/)

  Results from FactBites:
Fritz Zwicky - Wikipedia, the free encyclopedia (815 words)
Fritz Zwicky was born in Varna, Bulgaria, to Swiss parents.
Fritz Zwicky believed that the cosmic red shift is caused by photons gradually losing energy over distance, possibly due to resisting the gravitational fields between the source and the detector.
The asteroid 1803 Zwicky, the Zwicky lunar crater, and the galaxy I Zwicky 18 were all named in his honour.
U.Va. Top News Daily (696 words)
To prove that I Zwicky 18 is a new galaxy, Thuan and Izotov needed to show that it was devoid of stars from the first several billion years after the Big Bang, the period when a large fraction of stars in the universe were formed.
I Zwicky 18 is prototypical of this early population of small dwarf galaxies.
Further evidence for the youth of I Zwicky 18 is the fact that its interstellar gas is "nearly pristine," Thuan said, and composed mostly of hydrogen and helium - the primary two light elements created in the Big Bang - during the first three minutes of the universe's existence.
  More results at FactBites »



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