Alternative MethodsConventional Methods


March 29

We Were Very Wrong About the Number of Galaxies in the Universe

Javier Bush
Core Spirit member since Dec 24, 2020
Reading time less than 1 minute

Using the Hubble Space telescope and other observatories, astronomers have completed the most accurate census of galaxies in the observable universe to date. In terms of the actual number, let’s just say we were way the hell off.

The observable universe—that is, the part of the universe that’s visible to us on Earth—contains 10 to 20 times as many galaxies than previous estimates. 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).

And that’s just 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 haven’t had enough time to reach us. It’s difficult—if not impossible—to know how many galaxies reside outside this cosmological blind spot.

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.

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

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?”

Indeed, future observatories like the James Webb Space Telescope will allow us to study these ultra-faint galaxies.

By George Dvorsky/Gizmodo

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