Powerful stellar explosions may have caused mass extinctions on Earth and could also have prevented life from appearing on other planets until 5 billion years ago—and then only in the outskirts of galaxies.
Physics7, 96 (2014) – Published September 19, 2014
Quantum mechanics permits particles to follow bizarre, looping and curving trajectories, usually with very low probability. But a calculation shows that in some cases, these paths can have significant and possibly measurable effects.
Physics7, 94 (2014) – Published September 12, 2014
Experiments show that beams of left- or right-handed electrons are not equal-opportunity destroyers of molecules having two mirror-image forms, which supports the idea that primordial cosmic rays generated the asymmetry in biological molecules.