MEASURING THE COSMOS: Exploring the Limits of Time and Space | SPACETIME S08E05

THE COSMIC SCALE: How We Measure the Universe | SPACETIME S08E05

How do scientists measure something as vast as the universe? This documentary explores humanity's journey from the first measurements of Earth to today's most advanced space telescopes and cosmological models. Discover how Eratosthenes, Copernicus, Kepler, Newton, and Einstein transformed our understanding of space and time, and how missions such as Gaia, Euclid, Planck, LIGO, and the James Webb Space Telescope reveal the structure and evolution of the cosmos. From the Big Bang and cosmic expansion to dark matter, dark energy, and gravitational waves, this episode uncovers how we measure the universe—and why its greatest mysteries remain unsolved.

How do scientists measure the size of the universe? Astronomers combine methods such as stellar parallax, Cepheid variable stars, Type Ia supernovae, redshift measurements, and the cosmic microwave background to determine distances across the cosmos with remarkable precision.
Why is the speed of light so important in astronomy? Because light travels at a finite speed, looking farther into space also means looking further back in time. This allows astronomers to study galaxies and cosmic events that occurred billions of years ago.
What is the Hubble tension? The Hubble tension describes the discrepancy between different measurements of the universe's expansion rate. It could indicate unknown physics or reveal limitations in current cosmological models.

00:00 – Introduction
03:05 – Looking to the Sky: The Search for Order, Space, and Time in the Universe
09:55 – From Kepler to Newton: How Gravity and Mathematics First Explained the Cosmos
19:48 – The Cosmic Microwave Background: How the Big Bang Became the Key to Measuring the Universe
29:42 – Timekeeping and Relativity: Atomic Clocks, Gravity, and the Structure of Space-Time
39:55 – The Gaia Mission: Mapping the Stars and Revealing New Insights into the Milky Way

#space #spacetime #spacedocumentary

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