Are 94 percent of galaxies unreachable?

That distance, when you do the math of how the Universe expands, means that about 94% of all the galaxies contained within the observable Universe are already unreachable, no matter what we do

It means that the expansion of the Universe is carrying the bulk of the galaxies away from us faster than their light can reach us. Meaning we will never be able to see or observe them

How much of the universe is out of reach?

In other words, 97% of the observable universe is already forever out of our reach. (At least unless someone invents a faster than light drive.) It’s worth noting that, as the universe continues expanding, all galactic clusters will become isolated from each other.

What is 90% of our galaxy?

Our galaxy is made up of about 90% dark matter, matter that cannot be seen, and about 10% “luminous matter”, or matter that we can see with our eyes. This large quantity of dark matter causes an invisible halo that has been demonstrated by simulations of how the Milky Way spins

Is it possible to leave this galaxy?

The technology required to travel between galaxies is far beyond humanity’s present capabilities, and currently only the subject of speculation, hypothesis, and science fiction. However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel is impossible.

Even if we traveled at the speed of light, we’d never catch up to these galaxies

The universe is expanding, with every galaxy beyond the Local Group speeding away from us.

Today, most of the universe’s galaxies are already receding faster than the speed of light.

All galaxies currently beyond 18 billion light-years are forever unreachable by us, no matter how much time passes

As long as the light from any galaxy that was emitted at the start of the hot Big Bang 13.8 billion years ago would have reached us by today, that object is within our presently observable universe. However, not every observable object is reachable

Although there are magnified, ultra-distant, very red and even infrared galaxies in the extreme Deep Field, there are galaxies that are even more distant out there than what we’ve discovered in our deepest-to-date views. These galaxies will always remain visible to us, but we will never see them as they are today: 13.8 billion years after the Big Bang. (Credit: NASA, ESA, R. Bouwens and G. Illingsworth (UC, Santa Cruz))

Looking back through cosmic time in the Hubble Ultra Deep Field, ALMA traced the presence of carbon monoxide gas. This enabled astronomers to create a 3-D image of the star-forming potential of the cosmos. Gas-rich galaxies are shown in orange. You can clearly see, based on this image, how ALMA can spot features in galaxies that Hubble cannot, and how galaxies that may be entirely invisible to Hubble could be seen by ALMA. All of these galaxies will always be visible to us, but not reachable by us

Only 6% of presently observable galaxies remain reachable; 94% already lie beyond our reach

We are lucky that we are born at a time , when our telescopes can see distant galaxies

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