When you peer out into the depths of the cosmos, a mystery lies there, waiting. In a survey of the deep sky, most of the galaxies are seen rotating in the same direction. This is a problem. Under ...

The vast realm probed by radio astronomers is one invisible to the naked eye, and even most kinds of telescopes. Now, thanks to the latest advances in radio observatories, scientists are uncovering an ...

In a cafe at CERN in 1992, three physicists realized they disagreed about how many constants are needed to describe all of nature. A recent paper suggests only one – time – is necessary.

For decades, physicists have hunted for a single theory capable of explaining every force, particle, and interaction in the ...

As theoretical physics delves deeper into the fundamental nature of reality, we’re left to grapple with the questions it leaves us. For example, some physicists claim that our universe is merely an ...

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Scientists have many big questions to tackle about the universe, including how big it actually is. But even the proposed answers aren't straightforward.

ESA’s Euclid mission aims to uncover the mysteries of dark matter and dark energy, which together comprise the vast majority of the known universe. ESA’s Euclid mission aims to uncover the mysteries ...

Deep in the first moments of the Big Bang, the entire cosmos shook and rumbled. Those quakes still reverberate to the present day. It will take the most sensitive instruments ever imagined to reveal ...

Using data from the New Horizons spacecraft, astronomers have quantified the cosmic optical background (COB), confirming it as the cumulative light from billions of galaxies since the universe's ...