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" ... And yet, the gravitational effects of dark matter have been used by astronomers to indirectly measure its presence and amount that must be present in all sorts of situations across the Universe. Dark matter in galaxies causes the outskirts to rotate at a different rate than the stars’ mass alone predicts. Dark matter in galaxy clusters bends background light sources through gravitational lensing, and causes the individual galaxies within it to move around more quickly than predicted. When those clusters collide, dark matter separates from the normal matter, revealing an independent presence. And dark matter drives the formation of large-scale structure in our Universe, required to explain data from both deep galaxy surveys and the cosmic microwave background. ... "
" ... Gravity causes galaxies to rotate. Astronomers can study the speed of stars at different distances ... [+] from the galactic center to look for evidence for dark matter or other new physics. ... "
" ... How can you guard against a provider’s bait-and-switch strategy? One of the things to watch for is how fast the provider’s teams rotate. Is your talent being swapped in and out on a six-to-nine-month basis? Or is the provider using persistent teams? Are you even measuring that? If not, you can be sure that your provider will optimize for its profitability. ... "
" ... Sure, the individual components will change if you either rotate your perspective or rotate the line connecting those two points, as your definitions of length, width, and depth will change relative to one another for that line as the rotation occurs. But the overall distance between those two points doesn’t change at all; that quantity of the distance between those points remains what we call “invariant,” or unchanging, regardless of how you rotate them. ... "
" ... You see, being diversified is not simply about owning a lot of securities. It is also about how much of those securities you own. And, more to the point, it is about how you mix and rotate those securities during a market cycle. Many investors have succeeded in the past by owning index funds that replicate indexes like the S&P 500. ... "