Abstract:Exoplanet science encompasses one of the biggest existential questions: Are we alone in the universe? One promising approach to address this question is atmospheric spectroscopy, which ...
研究人员在宇宙中发现了一个“完美的太阳系”,它是在没有发生剧烈碰撞的条件下形成的。而地球所在的太阳系正是因为在形成时发生剧烈碰撞而成为了由不同大小的行星构成的大杂烩。新发现的行星系统距离地球100光年,由六颗大小基本一致的行星构成。
家庭联产承包责任制(household contract responsibility system),俗称“大包干”,是由农户以家庭为单位同集体经济组织签定承包合同(allow farming households to contract with the collective economic organizations),主要生产资料仍归集体所有,分配方面实行按劳分配原则(the ...