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Zwicky 18



Explanation: How old is this galaxy? The galaxy on the left, I Zwicky 18, was once thought to be one of the youngest galaxies on record since its bright stars indicated an age of only 500 million years. The galaxy was also intriguing because it resembled galaxies forming in the very early universe, but mysterious since it is so nearby -- only 59 million light years away -- and surrounded by galaxies that are significantly older. Recent images of I Zwicky 18 by the Hubble Space Telescope have helped resolve this mystery, discovering a population of old faint stars intermixed with the bright star population. Therefore I Zwicky 18 is now thought to be just as old as its neighbors, roughly 10 billion years old, but with an intense episode of relative new star formation. Possibly the trigger for this recent episode of bright star formation is the changing gravitational influence of I Zwicky 18's smaller companion galaxy, visible at the upper right.

http://it.wikipedia.org/wiki/I_Zwicky_18

La foto mi ha intrippato.

only 59 million light years away

andiamoci allora!

La foto è spettacolare, idem quella galassia.
Ce n'è un'altra ancora più eccentrica, ma non mi ricordo il nome.

Spesso hanno una forma stupenda, peccato per i falsi colori! Non si capisce mai quando mentono.

qUI un'altra galassia che mi ha incuriosito. (dal video stargaze universal beauty, 1080p).



http://chandra.harvard.edu/photo/2006/cartwheel/

This image combines data from four different observatories: the Chandra X-ray Observatory (purple); the Galaxy Evolution Explorer satellite (ultraviolet/blue); the Hubble Space Telescope (visible/green); the Spitzer Space Telescope (infrared/red). The unusual shape of the Cartwheel Galaxy is likely due to a collision with one of the smaller galaxies on the lower left several hundred million years ago.

Sono attualmente le due galassie più "strane" tra quelle che ho potuto vedere nel video.

Da questo 3d ho imparato che esiste google sky

http://www.google.com/sky/


fikata!