a brief discussion on geological catastrophes and spiral arms

• 机 构: departmentofphysicsandastronomy,committeeofyuanpeihonorsprogram,departmentofearthandspacesciences,de
• 出 处: 科技风
• 发表日期: 2010年11期

according to density wave theory,catastrophes can berelated to spiralarmsingalaxy.eachtime solar system entered into the spiralarms corresponds to impactevents,respectively.the spiralarms would impose an influence on earth and the solarsystem.