解释：就在情人节这天(美国东部时间)，太阳释放了它最具力量的爆炸之一——一个X级的耀斑。
Explanation: on Valentine's Day (ET) the Sun unleased one of its most powerful explosions, an X-class flare.
据美国太空局报，X级的耀斑（最高级别）爆发于格林尼治时间星期二上午1:56时（美国东部夏令时间星期一下午10:56时）。
The X-class flare -- the largest such category -- erupted at 1:56 a.m. GMT Tuesday (10:56 p.m. EST Monday), according to the US space agency.
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