The cosmos is not just moving; it is stretching.
In short: Most people imagine galaxies flying away from us like shrapnel. This video clarifies a deeper reality: the very fabric of space itself is expanding in every direction since the Big Bang.
The basic principles regarding how the universe expands are presented here, featuring Katie Mack of the Perimeter Institute's Hawking Chair in Cosmology and Science Communication. Rather than objects moving through pre-existing space, the universe has been stretching outward from its earliest moments.
The presentation explores how we observe this phenomenon and what it implies for our understanding of the cosmos. It serves as an entry point into theoretical physics, providing context on why an ever-growing universe changes our perspective on the scale and history of existence.
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Sources
- Summary by Intellect · source: Expansion of the Universe Explained | Cosmology 101 Episode 1
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