Scientists reconstruct the history of asteroid collisions

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An international study reveals that asteroids have endured a multitude of impact strikes since their formation 4,565 million years ago. Scientists have reconstructed a timeline of these collisions using a physics-based model which reproduces the process through time, comparing its results with present-day information about chondrite meteorites.
via Science Daily
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NGC 4631: The Whale Galaxy

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NGC 4631 is a big beautiful spiral galaxy. Seen edge-on, it lies only 25 million light-years away in the well-trained northern constellation Canes Venatici. The galaxy's slightly distorted wedge shape suggests to some a cosmic herring and to others its popular moniker, The Whale Galaxy. Either way, it is similar in size to our own Milky Way. In this sharp color image, the galaxy's yellowish core, dark dust clouds, bright blue star clusters, and red star forming regions are easy to spot. A companion galaxy, the small elliptical NGC 4627 is just above the Whale Galaxy. Faint star streams seen in deep images are the remnants of small companion galaxies disrupted by repeated encounters with the Whale in the distant past. The Whale Galaxy is also known to have spouted a halo of hot gas glowing in X-rays. Tomorrow's picture: light-weekend

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Types of carbon nanotubes' 'stuffing'

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Scientists have examined different types of carbon nanotubes' 'stuffing' and classified them according to the influence on the properties of the nanotubes.
via Science Daily

One impurity to bind them all

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Researchers show that a single atomic impurity is able to trap infinitely many bosons around it. Bound states of bosons are of particular interest because they give rise to long and strong interactions enabling new regimes for quantum simulations.
via Science Daily