Disruption of kilometre-sized asteroids by energetic collision

Article Abstract:

Rubble-pile asteroids appear to be common and the way that they behave on impact can be simulated. What happens in a collision depends on the extent to which the asteroid has already been fractured, and existing fragmentation will act as a shock absorber. The internal structure of an asteroid will affect the success of attempts to defelct it away from Earth. Detailed simulations are needed to predict the effect of nuclear explosions on asteroids and comets which travel near Earth.

Research, Asteroids, Collisions (Physics)

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Energetic motion detection

Article Abstract:

The detection of motion by a human observer has been modeled using random-dot kinematograms in two styles, motion energy and edge matching. However, the evidence does not support that these two styles are oppositional and they are much more likely to have similar or the same mechanisms based on zero-crossing patterns used to understand detection effects regardless of style.

Physiological aspects, Motion perception (Vision), Motion perception

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Energetic neutral atoms as the explanation for the high-velocity hydrogen around HD 209458b

Article Abstract:

The article discusses reason behind the presence of high-velocity atomic hydrogen at great distances from the extrasolar planet HD 209458b. The energetic neutral atoms obtained from the stellar wind protons are found to lead to the formation of hydrogen around the planet.

Environmental aspects, Observations, Astronomical research, Extrasolar planets, Stellar winds

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