The Wow! Signal
The Wow! signal was a strong, unexplained radio signal detected in 1977 by a telescope scanning the sky for possible messages from other…
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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…
The Origin of the Moon
How the Moon came to be is a question that has fascinated and divided scientists for generations. While one explanation is now favoured, important…
The Multiverse
The multiverse is the hypothesis that our universe is only one of many, perhaps even infinitely many, other universes. It is taken seriously by many…
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…
Is Pluto a Planet?
Whether Pluto should be called a planet is a question that has divided astronomers and captured the public imagination. Discovered in 1930 and…