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When the star eventually releases its outer layers, it shrivels down to its core in what's known as a white dwarf star. At that point, it'll be about the size of Earth.
。业内人士推荐WPS下载最新地址作为进阶阅读
（本报记者朱隽、王浩、常钦、郁静娴、李晓晴、邓剑洋）
This information asymmetry provides Google with significant competitive advantages, allows it to preempt, copy, and undermine competing products and services, and may open many questions about antitrust.
"It's only me and my twin sister," says Becky Joyce. "How long can we keep going when the need is getting bigger and bigger?"