The Hubble Tension
The Hubble tension is a genuine and growing puzzle in cosmology: two careful ways of measuring how fast the universe is expanding give answers that…
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How the Universe Will End
The ultimate fate of the universe is one of the deepest questions in science. Cosmologists have proposed several very different endings, and which…
Dark Energy
Dark energy is the name given to an unknown influence that appears to be driving the expansion of the universe to speed up over time. It is thought…
The Fermi Paradox
The Fermi paradox is the puzzling contrast between the high apparent likelihood that alien civilizations exist somewhere in our vast galaxy and the…