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When does winter start? Your guide to the 2025 winter solstice.Astronomical winter begins Sunday, Dec. 21 in the Northern Hemisphere. Here's how the solstice works.
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Earth had a secret neighbor, and it may explain our moonEarth may have a moon today because a nearby neighbor once crashed into us, a new analysis of Apollo samples and terrestrial rocks reveals.
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Hidden, supercharged 'thermostat' may cause Earth to overcorrect for climate changeRising levels of CO2 in the atmosphere may trigger a series of geological and biological processes that could ensure the next ice age arrives on time instead of being delayed, researchers say.
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NASA launches special mission to study Earth's mysterious "halo"NASA's Carruthers Geocorona Observatory has taken flight, and will soon start a two-year mission to study Earth's mysterious "halo".
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Vast source of rare Earth metal niobium was dragged to the surface when a supercontinent tore apartPotentially the largest known source of niobium discovered in central Australia formed 830 million years ago, and we can thank the breakup of the ancient supercontinent Rodinia.
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New 'quasi-moon' discovered in Earth orbit may have been hiding there for decadesA near-Earth asteroid lurked undetected for decades until a telescope in Hawaii spotted it earlier this year. It may be Earth's newest quasi-moon.
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When is the fall equinox, and why does it happen?On Monday, Sept. 22, day and night will be nearly equal in length as Earth's axis is side-on to the sun, officially beginning autumn in the Northern Hemisphere.
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Newly discovered bus-size asteroid will zoom close past Earth today — and will not return for exactly 100 yearsAsteroid 2025 QV5, which was first spotted in late August, will make a close approach to Earth on Wednesday (Sept. 3). It will not get this near to us again until Sept. 4, 2125.
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Cataclysmic crash with neighboring planet may be the reason there's life on Earth today, new studies hintEarly Earth may not have had the right ingredients for life — until a nearby Mars-size planet crashed into it, two new studies hint.
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