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Most viral Spacetime questions on Quora

Ranked by real engagement we track — views, upvotes, comments and shares per question. Updated continuously.

134Questions tracked
959.8KTotal views
17.6KTotal upvotes
165KVirality score
1 How do we know gravity actually affects time?
A really great proof on a modest scale was the famous Pound–Rebka experiment - Wikipedia at Harvard in 1959. In very brief, the researchers took an iron atom…
🔥 45.7K 👁 231.4K ⬆ 5.9K 💬 149 🔄 133 · Anonymous on Quora
2 Can a person enter a wormhole?
It is highly unlikely that you could enter a wormhole and survive. A wormhole is created by gravity so great that it bends space until you pinch the universe…
🔥 33.4K 👁 237.3K ⬆ 2.7K 💬 109 🔄 19 · Anonymous on Quora
3 When an astronaut is on the moon, are they in a time zone?
Earth time zones don’t apply on the moon. During the Apollo moon landings (1969 - 1972, the last time people were on the moon) nobody worried about what time…
🔥 14.1K 👁 77.7K ⬆ 1.5K 💬 85 🔄 39 · Anonymous on Quora
4 What does it mean that “Einstein's theory was about space and it was about time too”?
It’s a joke, most commonly shown through something like this image here:The joke is that Einstein’s theory of relativity unified space and time (previously t…
🔥 7.8K 👁 36.2K ⬆ 1.2K 💬 23 🔄 12 · Anonymous on Quora
5 Why does constantly turning left (or constantly turning right) always bring you back to where you started? Are there geometries where turning at the same rate never brings you back to your original location?
An infinite square helix lets you turn left however many times you want, never returning to the same location. However, that feels a bit lame. You don’t actu…
🔥 7.6K 👁 43.6K ⬆ 969 💬 25 🔄 3 · Anonymous on Quora
6 Why are tensors necessary for general relativity?
Using tensors is NOT necessary. Tensor calculus is just a very elegant way of writing a group of complex relations in a compact way. If you want, you could e…
🔥 6.4K 👁 44.6K ⬆ 440 💬 24 🔄 16 · Anonymous on Quora
7 Is it theoretically possible to build an "engine" that pushes against space-time?
Nope, sorry. Science fiction writers and science speculators like to point to the idea of the so-called “Alcubierre drive” as a way to do this. Ignoring for…
🔥 5.6K 👁 26.4K ⬆ 760 💬 67 🔄 2 · Anonymous on Quora
8 Why do astrophysicists explain Einstein’s gravity with nonsensical animations of space bending if spacetime is not tangible?
Because the alternative is to not describe it at all? General Relativity is a mathematical theory. It is a four dimensional theory about curved manifolds, an…
🔥 5.5K 👁 24.1K ⬆ 859 💬 45 🔄 1 · Anonymous on Quora
9 If time stops at a black hole's event horizon, how is it possible for matter to cross it and fall to whatever is inside?
Time doesn’t stop at the event horizon. That’s a mistake due to Schwarzschild’s metric having a singularity at the event horizon. Later it was realized that…
🔥 4.3K 👁 28.3K ⬆ 166 💬 77 🔄 7 · Anonymous on Quora
10 Does space have some fundamental "unit of space"?
This is an informal way of asking the more formal question, is space quantized? The answer is, we don’t know. Last I checked, most physicists assume that spa…
🔥 3.7K 👁 16.1K ⬆ 593 💬 36 🔄 0 · Anonymous on Quora
11 How is it that we see the same constellations every night, when if we orbit the sun in one year, allegedly, we should see a completly different set of constellations in half this time. Is it so to the constraints of our perception of spacetime?
Edit (29 May 2026): Several people have pointed out that in modern times, city dwellers aren't able to see the constellations and track their apparent moveme…
🔥 2.7K 👁 7.8K ⬆ 465 💬 46 🔄 1 · Anonymous on Quora
12 If space can expand faster than the speed of light beyond the cosmic horizon, then does it fall fast faster than the speed of light in a black hole?
Yes, you have hit on one of the most intuitive ways to visualize exactly what a black hole is. In General Relativity, there is a specific way of modeling gra…
🔥 2.5K 👁 13.2K ⬆ 291 💬 20 🔄 4 · Anonymous on Quora
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