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" ... As time continues to pass, and we cross from hundreds of millions of years to billions of years in our measurement of time since the Big Bang, galaxies gravitate together to form the Universe's first galaxy clusters. With up to thousands of Milky Way-sized galaxies in them, massive mergers form giant elliptical behemoths at the cores of these clusters. At the modern extremes, galaxies like IC 1101 can grow to quadrillions of solar masses. ... "
" ... If it is a black hole, there should be fifty quadrillions like it in the Milky Way alone, says Loeb. ... "
" ... In fact, based on how both of those quantities change over time, people will not only be able to reconstruct where Earth and our Sun is when they find it, they'll be able to figure out when those space probes were launched. It seemed like such a clever decision to choose these objects at the time. Pulsars are neutron stars — massive balls of neutrons more massive than the Sun, but only a few kilometers in diameter — that rotate extremely rapidly. Due to the charged particles that exist on their surfaces and their rapid rotation which can approach up to 65% the speed of light, these objects generate the strongest magnetic fields known in the Universe: trillions or even quadrillions of times as strong as the magnetic fields on Earth. ... "
" ... It's hard to imagine, given the full diversity of forms that matter takes in this Universe, that for millions of years, there were only neutral atoms of hydrogen and helium gas. It's perhaps equally hard to imagine that someday, quadrillions of years from now, all the stars will have gone dark. Only the remnants of our now-vibrant Universe will be left, including some of the most spectacular objects of all: black holes. But even they won't last forever. David Weber wants to know how that happens for this week's Ask Ethan, inquiring: ... "
" ... The thing about imagining the far future, though, is this: we can always imagine waiting a longer amount of time than whatever process we’re considering. Neutron stars and white dwarfs may be hot, small, and massive, but they will eventually radiate all of their energy away, too. After hundreds of trillions of years, they’ll fade away and become invisible; after quadrillions of years, they’ll finally approach absolute zero. ... "