At this stage, the star becomes a large red giant.
在此阶段，这个恒星变成了巨大的红巨星。
Its star is a red giant - a massive star near the end of its life. It is too dim to see in the night sky from Earth without a telescope.
Gliese 581是一颗已经接近生命终点的红巨星，星光十分暗淡，在没有天文望远镜的情况下，从夜空中根本无法看到。
Every 20 years or so the red giant star dumps enough hydrogen gas onto its companion White Dwarf star to set off a brilliant thermonuclear explosion on the White Dwarf's surface.
大约每过20年红巨星向它的白矮伴星上输出足够的氢气在白矮星表面产生一次耀眼的热核爆炸。
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