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I think all of them are marvellous. I am very much excited about LIGO because I think somehow it may provide data about dark matter and dark energy as well. All three high precision devices represent major breakthroughs to me. Comparing all the data may facilitate opening new windows to our understanding of the universe.
I think we should be clear about our concepts and the “reality” they refer. We may think that we have developed a conceptual tool called “spacetime”, yet we are able to calculate motion through its warping, moreover we detected gravitational waves through it. Whether on subatomic scales or astronomical scales, spacetime could be more than just a tool. It comprises of matter, emptiness or what not. And subatomic levels are in it too. Spacetime is the whole universe. So when we define gravity, as a warping effect of spacetime due to mass, considering that subatomic particles have miniscule mass, their warping effect may be ignorable, but this doesn’t bar any investigation with their relationship to spacetime. How could it be possible that we observe Hawking radiation around black holes? How could particles be dense and supermassive? These are questions which through new findings may illuminate the relationship of particles with spacetime and enrich our understanding of spacetime and universe.
In that regard, I would like to add that Einstein’s theory of general relativity and quantum mechanics seem to be incompatible due to scales. When it comes to gravity it is the mass of the object, regardless of its size, which is important. Black holes confirm the theory of GR and as they comprise of super dense collapsed particles, which are the subject of quantum mechanics, they seem to be the fertile ground which could provide new dimensions to our understanding of spacetime and spacetime. . The prevailing view of reality asserts that, things are “real” only when they are observed, without an observer we cannot talk about a “reality”. However we learned from Einstein’s theory of special relativity basically there may be two different “realities” of the same phenomena, depending on the frame of reference. It is true that “frame of reference” refers to an observer. And “quantum superposition” cannot be observed directly in that sense. However, it is observed in an indirect manner, by the double slit experiment and interference patterns of emitted light. In the “measurement effect problem”, the problem is not that the superposition cannot be observed directly, or we can measure the would-be “directly observed state” only as a set of probabilities. The problem may be that we don’t focus on “the effect of observation”, by asking “Why do we observe a particle instead of a wave?” or “Could this be about our state of observation, our expectations, our cognitive facilities”? However, these questions trascends the defined boundaries of physics and calls for the attention of neuroscience, biophysics and biochemistry, quantum chemistry as well.