Astronomers estimating the apparent age of the ring to be around 5, 000 years, also find more distant gas clouds perpendicular to the ring plane, seen here at the upper left and lower right.
天文学家推测该环的表面年龄大约在5000年左右，还发现垂直于该环形行星有着距离更远的气体云，图中就是左上和右下的部分。
Transportation officials say the plane was flight-worthy and they blame bad weather for the apparent crash.
交通部门的官员说，那架飞机符合安全航行标准。他们把坠毁归咎于天气恶劣。
Earlier this year, an air crew foiled a woman's alleged effort to ignite a commercial aircraft in an apparent terrorist act, and the plane successfully made an emergency landing in western China.
今年早些时候，一架飞机上的乘务员挫败了一名女性通过引燃客机实施恐怖行为的企图，这架客机后来成功在中国西部紧急着陆。
Earlier this year, an air crew foiled a woman's alleged effort to ignite a commercial aircraft in an apparent terrorist act, and the plane successfully made an emergency landing in western China.
今年早些时候，一架飞机上的乘务员挫败了一名女性通过引燃客机实施恐怖行为的企图，这架客机后来成功在中国西部紧急着陆。
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