Science

A meteorite that landed on Earth 200 years ago upends previous theories about the formation of Mars

A meteorite that hit Earth more than 200 years ago could fundamentally change our understanding of how Mars formed. Most of what we know about the Red Planet’s interior comes from three space rocks that landed on our planet after being thrown from Mars by impacts. These include the Chassingy meteorite, which fell in northeastern …

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NASA’s OSIRIS-REx spacecraft observes asteroid Bennu’s “Body Armor”

The remarkable terrain of the Bennu asteroid. Credit: NASA Goddard Space Flight Center Asteroid Bennu’s boulder-covered surface gives it protection against small meteoroid impacts, according to crater observations by[{” attribute=””>NASA’s Nature Geoscience. Bennu is a “rubble-pile” asteroid, meaning that it formed from the debris of a much larger asteroid that was destroyed by an ancient …

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Dark Stars: the first stars in the universe could have been powered by the annihilation of dark matter

Dark matter doesn’t really do much in the current universe. But in the early days of the cosmos, there may have been pockets of dark matter with a high enough density to provide a heat source for newly formed stars. Welcome to the weird and wonderful world of “black stars”. A dark matter dance The …

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A strange isolated group of polar bears discovered in Greenland

A Southeast Greenland polar bear on a glacier or freshwater ice at 61 degrees north in September 2016.Photo: Thomas W. Johansen/NASA Oceans melt Greenland Researchers have identified a previously unknown population of polar bears living in the isolation of southeast Greenland. Bears hunt seals in fjords, on freshwater ice shelves, rather than on rapidly receding …

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Physicists say they’ve built an atom laser that can work ‘forever’

A new breakthrough has allowed physicists to create a beam of atoms that behaves similarly to a laser and can theoretically stay on “forever”. It could finally mean that the technology is on its way to practical application, although significant limitations still apply. Nonetheless, it’s a huge step forward for what’s known as an “atom …

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