Is it possible to see the Milky Way galaxy through a gravitational lens?
95521
Since there are gravitational lenses, are there gravitational mirrors?
76612
How do I capture the milky way?
17218
Open problems in General Relativity
19607
Can the gravitational constant $G$ be calculated theoretically?
12267
(Almost) double light speed
10556
Can the Hubble constant be measured locally?
80207
Are moving objects producing stronger gravity fields?
20557
Does the curvature of spacetime theory assume gravity?
123545
How Are Galaxies Receding Faster Than Light Visible To Observers?
130652
Interstellar -- Black hole manipulation?
79258
Is an obstacle obscuring the EHT's view of Sagittarius A- star?
49151
Could there be a dark matter planet?
147202
Would approaching a distant star at near the speed of light unfold its entire history in "fast-forward"?
82377
Is it possible to produce gravitational waves artificially?
40309
Glass acting as a lens?
139832
Is it possible to make visible spotlight lightrays?
21173
Black hole formation as seen by a distant observer