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4 years ago in Astrophysics By Preetham M
Can someone explain the concept of spacetime in simple terms, and are gravitational waves real or just theoretical?
I'm teaching an introductory physics workshop and need a clear, accurate metaphor for spacetime curvature that avoids excessive math. Furthermore, I want to move beyond saying gravitational waves are "predicted" to accurately stating their current experimental status. Have they been directly observed, and if so, how?
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By Yasak Answered 3 years ago
For teaching, I often use this analogy: imagine spacetime as a flexible, invisible fabric. Objects with mass, like stars, create dips in this fabric. Other objects move along the contours of these dips, which we feel as gravity. It's not a perfect model, but it captures the unification of space and time into a dynamic medium. As for gravitational waves, they are absolutely real and no longer just theory. I've analyzed data from the LIGO and Virgo collaborations; these are laser interferometers that have directly detected ripples in spacetime from colliding black holes and neutron stars. The first detection in 2015 was a monumental confirmation of Einstein's century-old prediction.
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