Earths

dwarf galaxy NGC1427A

Dwarf galaxies of Earth’s second closest galaxy cluster are free of dark matter halos

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The standard model of cosmology suggests that a halo of dark matter particles surrounds most galaxies. However, this halo of dark matter is invisible, but its mass exerts a strong gravitational pull on galaxies in the vicinity. A new study by the University of Bonn (Germany) and the University of Saint Andrews (Scotland) challenges this …

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4.5-Billion-Year-Old Martian Meteorite Reveals Secrets of Earth’s Origins

4.5-Billion-Year-Old Martian Meteorite Reveals Secrets of Earth’s Origins

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What do Nature Communications, by an international team of researchers that includes a Northern Arizona University (NAU) scientist. Designated Northwest Africa (NWA) 7034, and nicknamed “Black Beauty,” the Martian meteorite weighs approximately 11 ounces (320 grams). Credit: NASA “This meteorite recorded the first stage of the evolution of Mars and, by extension, of all terrestrial …

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Earth's Magnetic Field Almost Completely Collapsed 550 Million Years Ago

Earth’s Magnetic Field Almost Completely Collapsed 550 Million Years Ago

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More than half a billion years ago, Earth experienced an almost-complete collapse of its magnetic field. It began in the early Cambrian period. Then, after a period of about 15 million years, the field began to grow again. The cause of that collapse and the bounceback of the field was a mystery. Then, a group …

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