The Miracle of the Expansion of the Universe (Quran)

The expansion of the universe is a miraculous process that has been ongoing since the Big Bang and has caused the dimensions of the observable universe to increase over time.

The Universe Is Continuously Expanding: What Does This Mean?

When we look up at the sky, we see stars, galaxies, and the dark void. Although they appear static, the universe is in fact a dynamic structure—and not only that, it is constantly expanding. So what exactly does the expansion of the universe mean? Are galaxies moving toward some distant location, or is space itself stretching? Today, we will discuss one of cosmology’s most astonishing yet most firmly grounded facts: the expansion of the universe.

One of the best ways to understand the expansion of the universe is through an abstract analogy. Imagine space as a stretchable rubber sheet. Galaxies are placed on this sheet like dots. When the rubber is stretched, the dots move farther apart. However, these dots—the galaxies themselves—are not moving independently; they are being carried apart by the stretching of the rubber.

The same applies to the fabric of space-time. Although galaxies appear stationary, the space between them is growing. In other words, the universe is, figuratively speaking, “inflating.”

The Quran States That the Universe Is Expanding

In the name of Allah, the Most Gracious, the Most Merciful.

"We built the sky with Our power, and indeed We are expanding it."

Surah Adh-Dhariyat, Verse 47

Allah (swt) has spoken the truth.

^{(Detailed Information} TDV⁾

The Milky Way, Space (pixabay)

The Edwin Hubble Observation

The expansion of the universe was discovered in the early 20th century by a scientist observing the night sky: Edwin Hubble. In 1929, he observed that the light from distant galaxies was shifted toward the red end of the spectrum. This redshift indicated that those galaxies were moving away from us. Moreover, the farther away a galaxy was, the faster it was receding. This was not merely motion through space—it was direct evidence that space itself was expanding. As observations accumulated over time, the conclusion became undeniable: we now know with certainty that the universe is expanding.

The Big Bang and the Scale Factor

The fact that the universe is expanding leads to a remarkable conclusion when we look backward in time: if everything is moving apart now, then in the distant past everything must have been much closer together. In fact, approximately 13.8 billion years ago, all matter and energy in the universe were concentrated in a single point. This is known in science as the Big Bang. Scientists measure this expansion using a parameter called the “scale factor.” This factor, which represents the size of the universe, was nearly zero in the past and is now defined as 1.

Space, the Universe (pixabay)

How Fast Is the Expansion?

To measure how fast the universe is expanding, scientists use the “Hubble constant.” Its current value is approximately 67.15 kilometers per second per megaparsec. This means that a galaxy located 3.26 million light-years away is moving away from us at a speed of 67 kilometers per second. Incredible, isn’t it? But even more astonishing is this: if a galaxy is sufficiently distant, the expansion rate can exceed the speed of light! While this may seem to violate physical laws, it is entirely consistent with the structure of the universe.

Dark Energy Enters the Picture

For a time, scientists believed the expansion of the universe was slowing down, since gravity should be pulling galaxies toward each other. However, recent measurements have shown that the expansion is accelerating. To explain this, scientists introduced a new concept: dark energy.

Dark energy is a term used to describe an unknown force that drives the expansion of the universe. It is thought to make up approximately 68 percent of the universe.

Space, the Universe, Astronaut (pixabay)

Even Light Cannot Catch Up

The expansion has reached such a scale that light from some distant galaxies will never reach us. These galaxies are receding faster than the speed of light relative to us. This has profound implications for understanding the boundaries of the universe: the observable universe may be only a small portion of the entire universe.

The expansion of the universe cannot be understood simply by looking at the night sky. It is a fact established through mathematical models, physical observations, and decades of rigorous research. And this fact reveals that the universe is not static but a living, evolving structure.

We still do not know why the universe is expanding, whether this expansion will continue forever, or whether it might eventually reverse into a “collapse.” But we do know this: the universe is still expanding. This expansion deepens our wonder and makes the cosmos we inhabit even more awe-inspiring.