Initial estimates WAY off on number of known galaxies


These are the advances made by the Hubble Telescope over the last 25 years.

Our increasing technology has allowed our puny ape-like eyes to peer into the depths of space with more clarity than ever before.

This knowledge has GREATLY expanded our understanding of just how much… other stuff… there is in the observable universe.

The observable universe, being only a small percentage of the universe, is all we are able to reasonably measure, because, well, it’s all we are able to observe. The fact is a LOT of the universe is SO freakin’ far away, the light hasn’t had a chance to reach us yet, so we are at best speculating based on what we do know.

And what do we know? Based on recent Hubble data, our initial estimates of how many galaxies exist in this observable universe was WAY off. Estimates are now putting at least 10 to 20 times MORE galaxies than previously estimated. That raises the total to somewhere between one and two trillion galaxies, which is up from the previous best estimate of 100 billion galaxies. Consequently, this means we also have to update the number of stars in the observable universe, which now numbers around 700 sextillion (that’s a 7 with 23 zeros behind it, or 700 thousand billion billion). Sextillion is such a big number… spell check doesn’t even recognize it.

The largest and most versatile space telescope... the NASA created Hubble Telescope
The largest and most versatile space telescope… the NASA created Hubble Telescope

Again, that’s within the ‘observable universe’. Because the cosmos emerged some 13.8 billion years ago, we’re only able to observe objects up to a certain distance from Earth. Anything outside this “Hubble Bubble” is invisible to us because the light from these distant objects simply hasn’t had enough time to reach us. It’s difficult—if not impossible—to know how many galaxies reside outside this cosmological blind spot.

“It boggles the mind that over 90 percent of the galaxies in the universe have yet to be studied…”

To come up with the new figure, an international team of astronomers led by Christopher Conselice from the University of Nottingham, UK, used deep space images from Hubble, and combined them with data collected by other astronomers. The images were converted into 3D, allowing the researchers to make accurate measurements of the number of galaxies at various stages in the universe’s history.

They were able to peer back into time, showing that the early universe was cluttered with many tiny galaxies, which eventually merged with other tiny galaxies, forming many of the larger objects we see today. The results of this latest celestial survey, which are set to be published in the Astrophysical Journal, shows the significant degree to which galaxies have evolved over the course of the universe’s history.

Using new mathematical models, the astronomers were also able to infer the existence of galaxies that the current generation of telescopes cannot detect. The researchers say there must be a further 90 percent of galaxies in the observable universe that are too dim and far away for us to see using current telescopes.

“It boggles the mind that over 90 percent of the galaxies in the universe have yet to be studied,” noted Conselice. “Who knows what interesting properties we will find when we discover these galaxies with future generations of telescopes?”

There is a lot of space stuff out there...
There is a lot of space stuff out there…

Dedicated to the Hubble…