By Neil Bowdler, BBC News

媒体英语会带大家一起学习BBC撰稿人在报道世界大事时常用到的单词和短语。

Background:科学家近日通过"开普勒"太空望远镜观测到一个距离地球2000光年的奇特行星系统。其恒星与太阳相似，并有6颗行星围绕它运行。

Finding six new planets around a single star represents an impressivehaul. Nasa is calling it the best find since the first so-called'exoplanet' was discovered 16 years ago. It might not be the most populated solar system yet found - six or possibly seven planets have been found in a rival system, but it's the nature of this new discovery which is getting the astronomers scratching their heads in wonder.

Five of the six planets are crammedtightly in around the Kepler-11 star, with orbits of between just ten and 47 days. That means they're all super hot, but the data suggests they're also made mostly of gas.

That's strange, because small hot planets this close in should have been ripped asunder by their parent star in their formative years, say the scientists. One possible explanation is that the planets started out bigger and further out and were slowly dragged into tighter orbits, as part of a contracting belt of dust and asteroids.

• system [´sistəm]   n.系统，体系，制度   (初中英语单词)
• mostly [´məustli]   ad.主要地；多半；通常   (初中英语单词)
• explanation [,eksplə´neiʃən]   n.解释；说明；辩解   (初中英语单词)
• impressive [im´presiv]   a.给人深刻印象的   (高中英语单词)
• so-called [´sou ´kɔ:ld]   a.所谓的，号称的   (高中英语单词)
• tightly [´taitli]   ad.紧，紧密地   (高中英语单词)
• asunder [ə´sʌndə]   a.分开地；零散地   (英语四级单词)
• calling [´kɔ:liŋ]   n.点名；职业；欲望   (英语六级单词)