Miracle: Expansion of Universe in the holy Quran

Scientific Miracle: Expansion of Universe in the Quran.
The universe has been expanding ever since the Big Bang.

Astronomers just confirmed the existence of "Dark Energy", a mysterious repulsive force that acts in opposite to gravity. As the distance increases, the attractive gravitational force decreases but this mysterious repulsive force increases. This repulsive force is pushing galaxies apart; the greater the distance the greater the repulsion. Scientists today do not know what this "Dark Energy" is, but they know that it is causing the entire universe to expand at an increasing rate.

[Quran 51.47] And the heaven, We built it with craftsmanship and We are still expanding.

How could an illiterate man who lived 1400 years have known about the expansion of the universe?

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Author: in2islam