| 1. | Several explanations have been proposed , including cycles of magnetic activity somewhat similar to our own sun ' s sunspot cycle , the action of companion stars orbiting around the dying star , and stellar pulsations
现在有几个被提出的解释,包括像我们自己的太阳黑子周期的磁场周期活动，围绕衰老的恒星轨道有规律运动的伴星。 |
