Can we observe an edge of the universe?
141317
How would it be to look at the sky if the earth were near the edge of the universe?
99605
If you view the Earth from far enough away can you observe its past?
145010
Can we see shape of normal curve somewhere in nature?
155345
Can we use curved spacetime to measure the one-way speed of light?
10377
Is redshift the only way by which we can tell that space is expanding?
20960
Seeing the shadow of a black hole
101201
How do we know the size of the universe?
152130
Maximum size of the observable universe?
64715
How is it possible that we see light from shortly after the big bang?
10362
Does the universe have a center?
95674
Expansion of the Universe, will light from some galaxies never reach us?
45174
Measuring extra-dimensions
130124
Is it possible to learn about an event that occurred outside of your observable universe?
69464
Do we know why there is a speed limit in our universe?
51042
How is it possible to come to a conclusion that Universe is a result of the Big Bang while we aren't able to observe the entire Universe?
32598
Are wormholes really a valid shortcut to distant points in the universe?
112264
Cosmological constant doubts