Word: detectably
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Dates: during 1960-1969
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...light at one end to longer-wave-length red at the other, star spectra show a series of characteristic bright and dark vertical lines that indicate the presence of specific chemical elements. In 1868, one such line in a spectrogram of the sun enabled British Astronomer Norman Lockyer to detect the existence of a new element-helium-before it was discovered on the earth...
...they even sympathize with their leaders. Fearing that Wilson will delay negotiating with the UDI government until the Rhodesian economy has lapsed into chaos, the Conservatives have sent Selwyn Lloyd to Rhodesia on a "fact-finding" mission. The Tories will capitalize on any indications of submissiveness he may detect. They insist that there must be no question of direct rule by Britain at the time of the rebellion. Rhodesia should be subject to limited white control under a constitution which protects African rights and provides for eventual majority rule...
Extra Rations. Besides attacking Vinh Hoa, the trainees learn to set up and patrol a defense perimeter, detect enemy booby traps and set out their own, establish listening posts; they spend 29 hours practicing night defense and are taught to catch wild animals to supplement their C rations. They also see a full-size Viet Cong prisoner stockade, including a solitary-confinement pit, and learn how to evade their captors' questions. Even at night, G.I.s in the main camp are liable to be attacked by "terrorists" from Vinh Hoa. Above all, they are taught to be on the alert...
With a sensitive receiver tuned to the UHF frequency of about 670 megacycles, for example, non-earth beings might first detect the signal of an East Coast city's channel 47 as it fans across their distant planet. The rotating earth would bring the signal of a Midwest channel 47 into range about two hours later, a California channel 47 about three hours after the East Coast signal. Not that the observers far in space would be able to distinguish the educational, news and entertainment programs that were shown last week; but they would probably be able to detect...
...sign of the vast highway networks, bridges, dams, or even cities on Earth could be found on the photos, said Sagan. Even differences in shading caused by seasonal changes in vegetation were difficult to detect, although many of the pictures were taken months apart. Concluded Sagan: the Mariner 4 pictures neither prove nor disprove the possibility of life on Mars...