Word: detectable
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...evidence that excited Viking scientists came from two of the three biological tests that had begun only three days earlier. One of the Viking experiments, designed to detect respiration, showed that 15 times as much oxygen as the scientists expected had come from the Martian soil sample. The other, which uses radioactive tracers to look for signs of metabolic activity, showed what Klein called "a very strong, positive response." Said a Viking spokesman: "If there is life on Mars, this is what it should be doing...
Barghoorn added that it is possible that life once existed on Mars but is now extinct. The only way to detect that possibility would be to bring rocks from Mars back to Earth. He said we now have the technology for such a mission but it will probably not be launched for at least another decade...
...meanwhile, will sample the contents of the Martian atmosphere, register the planet's temperatures, which range from a low of -200° during darkness to a high of +50° during the day, and record wind velocities, barometric pressures and humidity. A seismograph, placed aboard the Viking to detect Marsquakes and volcanic activity, was apparently not working at week's end, but scientists still had hopes that they could coax it into operation...
...powered hunter-killer of the "November" class. Trouble-ridden from the time they were first commissioned in 1958, November-class subs have rarely shown their periscopes outside Soviet waters since one sank off the English coast in 1970. Besides, the submarines-famed for their noisiness-are absurdly easy to detect. When they dive, observes one Norwegian navy officer, they sound "like the flushing of an antique toilet." The sub involved in the Sjevik incident was not even given a chance to make a rackety descent. After it had dragged the Norwegian ship backward and then finally surfaced, crewmen scrambled...
...Which can sometimes detect tumors because their temperature is higher than that of surrounding breast tissue...