But the alarming thing is that astronomers recently have been studying stars that are similar to our Sun, brighten by a factor of as much as 20. Doesn't last for very long.
しかし 不安にさせることは 天文学者が近年 太陽に似た星を研究し 太陽の年齢に近く 20倍も輝く星を いくつも発見したことです