来自美国宇航局艾姆斯研究中心的天文物理学家斯科特·桑福德说：“在大多数情况下，因为没有标本样品，具体联系都是靠猜测得出的。”
"In most cases, it's all kind of guesses because we don't have samples," says Scott Sandford, an astrophysicist at the NASA Ames Research Center.
检测方法：气体传感器阵列。研究人员研制出一种设备，它能分析管组织标本中的挥发性化学物质，以此确定样品是否具有癌变性。
Detection: Gas sensor array. Researchers have developed a device that can analyze the volatile chemicals emanating from a tissue specimen tube to determine whether the sample is cancerous.
这幅显微照片是通过扫描穿过样品的电子束而获得的，同时检测器对从样品表面反弹的电子进行追踪，这些电子显示了标本的外形。
This photomicrograph was obtained by scanning a beam of electrons across the sample while a detector kept track of electrons bouncing off its surface, betraying the specimen's outer shape.
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