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The Dark Energy Survey Collaboration collected information on hundreds of millions of galaxies across the Universe using the U.S. Department of Energy-fabricated Dark Energy Camera, mounted on the U.S. National Science Foundation Víctor M. Blanco 4-meter Telescope at CTIO, a Program of NSF NOIRLab. Their completed analysis combines all six years of data for the first time and yields constraints on the Universe's expansion history that are twice as tight as past analyses.

After months of protests led by Nobel laureate Reinhard Genzel, the American energy company AES Andes has abandoned plans to build a massive solar and wind facility just kilometres from one of the world's premier telescope sites. The decision preserves the pristine night skies above Chile's Paranal Observatory, where the European Southern Observatory operates some of humanity's most powerful eyes on the universe.

Nearly a century after Edwin Hubble discovered the universe's expansion, astronomers have finally explained the nagging mystery of why most nearby galaxies rush away from us as if the Milky Way's gravity doesn't exist? The answer lies in a vast, flat sheet of dark matter stretching tens of millions of light years around us, with empty voids above and below that make the expansion appear smoother than it should.

Researchers using machine learning have discovered hundreds of mysterious bright streaks on Mercury's surface that appear to be caused by gases escaping from the planet's interior. The finding suggests the Solar System's smallest planet isn't the static, geologically dead world we thought it was, Mercury might still be active today, continuously releasing material into space even billions of years after its formation.

The galaxy MoM-z14 could offer clues to what the universe looked like in its early infancy

Our current understanding of the Cosmos shows that structures emerge hierarchically. First there are dark matter densities, then dwarf galaxies. Those dwarfs then merge to form more massive galaxies, which merge together into even larger galaxies. Evidence of dwarf galaxy mergers is difficult to obtain, but new research found some in the Milky Way's halo.

The American Psychiatric Association has announced big upcoming changes to psychiatry’s big book of mental disorders, the DSM

Icy weather brings a serious risk of falls. Here’s how to stay safe

Many countries are debating whether to follow Australia and ban social media for younger teenagers. But with more robust evidence on its harms coming, we shouldn't be too hasty

Many countries are debating whether to follow Australia and ban social media for younger teenagers. But with more robust evidence on its harms coming, we shouldn't be too hasty

While snakes and ladders is purely a game of chance, there is a way to add some strategy, says mathematician Peter Rowlett

While snakes and ladders is purely a game of chance, there is a way to add some strategy, says mathematician Peter Rowlett

Where is physics headed? No one knows for sure, but Beyond the Quantum by Antony Valentini is a striking new book that reminds us what a big idea really looks like, finds Jon Cartwright

Where is physics headed? No one knows for sure, but Beyond the Quantum by Antony Valentini is a striking new book that reminds us what a big idea really looks like, finds Jon Cartwright

The books, TV, games and more that New Scientist staff have enjoyed this week

The books, TV, games and more that New Scientist staff have enjoyed this week

Susan Wise Bauer's The Great Shadow investigates the effects of illness on individual lives and collective beliefs. It's a mixed bag, says Peter Hoskin

Susan Wise Bauer's The Great Shadow investigates the effects of illness on individual lives and collective beliefs. It's a mixed bag, says Peter Hoskin

From health tech developers to influencers, our health is being monetised – and we need to be aware of what's going on, says Deborah Cohen