“guest star” , “客星”

Reuters / NASA / ESA / JPL-Caltech / UCLA / CXC / SAO / Handout
Mystery of oldest-recorded supernova solved | News | National Post
http://news.nationalpost.com/2011/10/25/mystery-of-oldest-recorded-supernova-solved/ 
NASA望远镜揭两千年前超新星爆炸之谜(图)_科技频道_凤凰网
http://tech.ifeng.com/discovery/detail_2011_10/26/10153213_0.shtml