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'Giant arc' stretching 3.3 billion light-years across the cosmos shouldn't existHow big is too big?
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Can we stop time?Here's how we might stop the flow of time.
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Our galaxy is warped, and scientists have no idea whyNew study fuels a debate over whether the galaxy's warp is moving.
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A dozen ultra-high-energy particle accelerators discovered in the Milky WayNew observations help astronomers hone in on a long-standing mystery about where cosmic rays come from.
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What is space-time?A simple explanation of the fabric of space-time.
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Astronomers keep finding mysterious circular rings in the sky and don't know how to explain themMysterious circular objects in the distant universe are challenging for astronomers to explain.
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Watch a black hole tear a star to bits in epic new animationAn animation depicts the gory details of a black hole devouring a star.
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Dark matter could be destroying itself inside the bellies of exoplanetsResearchers propose learning more about dark matter by looking for its effects inside exoplanets.
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Stars made of antimatter could exist in the Milky WayAstronomers try to solve the mystery of antihelium by searching for antistars.
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'Exotic compact objects' could soon break physics, new study suggestsGravitational wave detectors could soon uncover hints of new physics from exotic compact objects.
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One of Earth's nearest stars may be a dark matter factoryA hunt for hypothetical axions streaming from Betelgeuse turns up empty but helps physicists set constraints on their properties.
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'Dark sirens' could solve one of the greatest mysteries in cosmologyA team has offered a way for gravitational wave events called dark sirens to resolve a crisis in cosmology
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We should study 'dead' alien worlds, and maybe (carefully) seed them with lifeLooking at the scientific information gleaned from lifeless worlds could help in the search for life, one astrobiologist says.
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This golden box will soon make oxygen on Mars. That's great news for human explorers.Mars' Perseverance rover will help pave the way for future humans to travel to the Red Planet with a small instrument known as the Mars Oxygen In-Situ Resource Utilization Experiment (MOXIE).
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Ghost particle travels 750 million light-years, ends up buried under the Antarctic iceAstronomers spot two highly delayed signals from two different black holes tearing apart stars in their vicinity.
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Now that Perseverance has landed on Mars, what will the rover do inside Jezero Crater?Looking at the engineering and science behind selecting samples for NASA's Perseverance rover.
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What is the cosmological constant?What we know about the history and properties of "Einstein's biggest mistake," the cosmological constant
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What is ozone?Exploring the molecule known as ozone, which can both protect and harm us here on Earth.
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100,000-year-old story could explain why the Pleiades are called 'Seven Sisters'A speculative hypothesis tries to uncover the world’s oldest story written across the night sky in the Pleiades constellation.
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10 huge black hole findings from 2020Here, we take a look at some of the most spectacular black hole findings of 2020.
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Extraterrestrial evidence: 10 incredible findings about aliens from 2020Are we alone in the universe? Many discoveries about aliens in 2020 seemed to increase the prospect of extraterrestrial entities existing.
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Physicists discover the 'Kings and Queens of Quantumness'A new mathematical framework helps physicists define the degree of quantumness of a system
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'Grand claims' of life on Venus lack evidence, skeptics sayA roundup of the various pushback and criticisms to the claim that there could be life on Venus
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What is dark matter?Basic facts about the unknown material called dark matter.
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