DEC 11, 2020 6:00 AM PST

Cosmic Expansion: Universe Stretches, We don't

WRITTEN BY: Daniel Duan

Physicists believe that we exist in an expanding universe. But what does that mean? Do our habitats, bodies, and atoms "blow up" as the spacetime fabric stretches?

In the early 20th century, scientists, including famed astronomer Edwin Hubble, concluded that our universe is expanding based on Hubble's observation that distant galaxies are receding from the Earth. This idea is built on the redshifted light emitted from these remote objects, a seemingly showcase of the Doppler effect.

But it's worth noting that the redshift in this backdrop isn't truly a Doppler effect of electromagnetic waves. Instead, it's due to the expansion of space (also known as cosmological redshift). In other words, while the fabric of spacetime gets stretched by the dark energy, every atom inside of our body and planet are still bound together by gravitational force and electromagnetism. Therefore, the cosmic expansion won't cause our world to go puff.

Source: Veritasium via Youtube

About the Author
  • Graduated with a bachelor degree in Pharmaceutical Science and a master degree in neuropharmacology, Daniel is a radiopharmaceutical and radiobiology expert based in Ottawa, Canada. With years of experience in biomedical R&D, Daniel is very into writing. He is constantly fascinated by what's happening in the world of science. He hopes to capture the public's interest and promote scientific literacy with his trending news articles. The recurring topics in his Chemistry & Physics trending news section include alternative energy, material science, theoretical physics, medical imaging, and green chemistry.
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