novas

Su UMa-type dwarf novas belong to cataclysmic variable stars , whose character is magnified explosion , i.e. , super-explosion .

SUUMa-type矮新星属于激变变星，其特征是存在扩大了的爆发即超爆发。

During the period between the Shang Dynasty and the end of the 17th century , 78 novas and especially 12 supernovas were recorded in China 's historic books.Such a rich and systematic record of supernovas is unique in the world .

自商代至17世纪末，中国史书共记载了78颗新星、12颗超新星，这么丰富而又系统的超新星纪事，在世界上是独一无二的。

After the birth of the radio telescope in the 1930s , many scholars in the world , in an effort to search for the correspondence beiween the radio source in the Milky Way galaxy and the supernova , carried out detailed research on the ancient re-cords on novas and supernovas .

20世纪30年代射电望远镜问世后，世界上许多学者为了寻找银河系中射电源和超新星的对应关系，无不对中国古代的新星、超新星记录做详细研究。

Novas and supernovas are all variable stars created by nova outbursts.During a nova outburst , the brightness may increase over the course of a few days by several thousand or even dozens of thousands of times.Then it will gradually dim , eventually returning to its originai brightness after several or dozens of years .

新星和超新星都是由新星的爆发而产生的变星。新星的爆发有时能在几天时间内将这颗星的亮度增强几千到几万倍，随后它又会渐渐暗弱下去，几年或十几年之后最终回到原来的亮度。