As I finished my PhD in 1992, the universe was full of mystery – we didn’t even know exactly what it is made of. One could argue that cosmologists had made little ...
That might be what astronomers felt when they discovered an evolved galaxy similar to the Milky Way, but lighting up space when the universe was merely 700 million years old. Given that most ...
Specifically, cosmologists can’t yet account for how expansion of the universe increased in the “recent cosmological past”—a very relative term—because all attempts to quantify the change so far end ...