对树木年轮物质的光谱分析表明，碳-14浓度在一年内急剧上升，这与发生在公元前5410年左右的极端太阳高能粒子事件相一致。
Cosmic rays
Posted inResearch Spotlights
Tree Rings Show Record of Newly Identified Extreme Solar Activity Event
Mass spectroscopy of tree ring material indicates a sharp, single-year rise in carbon-14 concentrations consistent with an extreme solar energetic particle event that occurred around 5410 BCE.
Posted inNews
Taking Stock of Cosmic Rays in the Solar System
Scientists seek to understand the elusive properties of stellar and galactic cosmic rays before searching for life on exoplanets.
Posted inNews
An Underwater Telescope to Study Sky and Sea
To peer into the farthest reaches of the universe, you must first build a giant underwater telescope.
Posted inNews
Trying Out Muons to Detect Carbon Leaks
Scientists look into tracking carbon dioxide within a sequestration reservoir—and spotting possible leaks—by observing naturally generated, fast-moving muons that penetrate the underground storage area.