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Ten times more galaxies than previously believed

The uncertainty of science: A new analysis from Hubble and other telescope data suggests that the universe actually contains ten times more galaxies than previously estimated, several trillion instead of the past estimate of 100 to 200 billion.

I would not bet much money on this conclusion. I suspect that further research will find even more galaxies, since our deep observations of the universe are at the moment confined to a mere handful of Hubble deep field images that cover only a few tiny specks of space.

This new analysis however did confirm previous estimates that suggest the universe has evolved and changed significantly over time.

In analysing the data the team looked more than 13 billion years into the past. This showed them that galaxies are not evenly distributed throughout the Universe’s history. In fact, it appears that there were a factor of 10 more galaxies per unit volume when the Universe was only a few billion years old compared with today. Most of these galaxies were relatively small and faint, with masses similar to those of the satellite galaxies surrounding the Milky Way.

These results are powerful evidence that a significant evolution has taken place throughout the Universe’s history, an evolution during which galaxies merged together, dramatically reducing their total number. “This gives us a verification of the so-called top-down formation of structure in the Universe,” explains Conselice.

Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

5 comments

  • wayne

    Intriguing…

  • Localfluff

    Filling in the blanks.
    Just intuitively, I sense a trend of discovering stuff in places previously thought to be empty. Something from nothing. From Solar System objects to vagabond planets to satellite galaxies to intergalactic stars. Not to mention dark matter and energy. Just by meta-extrapolating from human psychology, I bet that this trend will continue to compound in unforeseen ways.

  • wayne

    Cosmology: the physical edges of the Universe
    Edges of Astronomy 2014
    (Australian Academy of Science)
    https://youtu.be/-xhb90JSHnA

  • Joe

    Worlds without ends, we can point our telescopes towards where we think the Big Bang occurred, but we will not know where it begins or ends, fascinating indeed.

  • Sarah Yarbrough

    Because we are the smartest and Greatest things in the MANY UNIVERSES there couldn’t possibly be a GOD. But a doctor can alter DNA in surgery and that size is at least equivalent to what this Earth is to planets in OUR OWN GALEXY…oh, they have bigger MOONS than us. But since we are the TOP OF THE FOOD CHAIN IN ALL THE UNIVERSES…then there can’t be something like GOD TO US!!!

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