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" ... The U.S. has been a place -- and should remain one -- where these types of questions are asked. Admittedly, these "big" questions may never be answered satisfactorily but, during the search, exploration itself becomes the driving force: our nation in search of the frontier, spatially and experientially. To make this happen, we need a sense of place that includes what is known and what is not, what is possible and what lies beyond our capabilities. Without such urgency of mind, the time flame of our intentions becomes shorter and our motives smaller-minded. ... "
" ... The Universe is not curved on the largest scales, but is spatially flat to 499 parts in 500: the tightest constraint ever. The Universe not only needs dark energy, but it makes up 70% of the Universe and is perfectly consistent with a cosmological constant. Of the other 30%, 25% is dark matter and just 5% is normal matter, with the Universe expanding at 68.2 km/s/Mpc. This is based on over 2 million galaxies observed from nearby to in excess of 19 billion light-years away, corresponding to more than 11 billion years of cosmic history. ... "
" ... The answer to this doesn’t need to be a procedure specific enough to actually do the experiment; a general outline would be sufficient. And, in fact, we have a couple of centuries of experience at doing exactly this: When we want to show that something has been in two states at the same time, we do an interference experiment. We put our system of interest in a superposition of two states, arrange for those two states to evolve at slightly different rates for some time, and then bring them back together and measure the final state. If a superposition exists, there will be some oscillation in the probability of a given final state that depends on the differential evolution in the middle. This takes lots of forms– if the two states of the superposition correspond to passing through spatially separated slits, it’ll show up as an interference fringe pattern in space; if they’re two states of a cesium atom in an atomic clock, it’ll show up as a varying probability of ending up in one of those states as you adjust the frequency of your microwave oscillator. ... "
" ... The light from the cosmic microwave background and the pattern of fluctuations from it gives us one... [+] way to measure the Universe's curvature. To the best of our measurements, to within 1 part in about 400, the Universe is perfectly spatially flat. ... "