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Astro Bob

Hubble Crams 15,000 Galaxies Into A Single Photo

23 Aug 2018, 21:16 UTC
Hubble Crams 15,000 Galaxies Into A Single Photo
(200 words excerpt, click title or image to see full post)

Astronomers are assembling one of the most comprehensive portraits yet of the universe’s evolutionary history, based on observations by the Hubble Space Telescope and other space and ground-based telescopes. This recent image, photographed by the Hubble in ultraviolet light, opens a new window on the universe, tracks the birth of stars over the last 11 billion years back to the cosmos’ busiest star-forming period, about 3 billion years after the Big Bang. This photo captures a sea of approximately 15,000 galaxies — 12,000 of which are star-forming — widely distributed in time and space. Nearly every point of light is a galaxy. Click for a large version. NASA, ESA, P. Oesch (U. of Geneva), and M. Montes (U. of New South Wales)
Astronomers estimate there are some 2 trillion galaxies in the universe. Just to give you an idea of how big that number is, a trillion is a million multiplied by a million or one followed by 12 zeroes. Then multiply that by 2. As recently as 2013 the galaxy count stood at just 200 billion until a new analysis in 2016 upped the number 10 times to 2 trillion.
Since it’s hard to see any galaxy up close ...

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