新星和超新星
- 网络nova and supernova
新星和超新星-
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。
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 .