Can invisible galaxies exist?
95674
Expansion of the Universe, will light from some galaxies never reach us?
49151
Could there be a dark matter planet?
94138
What is invisible to x-rays?
86091
Can black holes actually merge?
67531
Universe being flat and why we can't see or access the space "behind" our universe plane?
75058
Why isn't an infinite, flat, nonexpanding universe filled with a uniform matter distribution a solution to Einstein's equation?
64286
How can gravitions exist without violating GR?
99437
Using a naked black hole as a mirror?
102940
Why don't the black holes appear black in color in images of galaxies taken from HST?
68188
Are scientists missing the point with distant cosmic objects, or is it just me?
13269
How would we tell antimatter galaxies apart?
53299
Can we have a black hole without a singularity?
40593
Why the CMB has not been dispersed so far?
71847
Is there any evidence of black holes existing?
40328
Can something be nothing?
86865
The Higgs field a new Luminiferous aether?
109019
Does hidden just mean unseen and unheard?