Word: spacecrafts
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Dates: during 1980-1989
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...alien spacecraft that exploded while trying to land on earth. A hit by a stray bit of antimatter, or a speeding mini-black hole, or the head of a comet. These are some of the fanciful theories offered over the years to explain the fireball in the sky and the giant explosion that devastated a remote region of Siberia on June 30, 1908, leveling trees for miles around, knocking over huts, stampeding reindeer and creating an enormous shock wave detected around the world...
...them scan the cosmos for signals from dense, dark and dusty pieces of galactic real estate that cannot be observed visually. State-of-the-art infrared detectors routinely fly aboard high-altitude balloons and reconnaissance aircraft, seeking evidence for heretofore unrecognized warm regions of space. Ultraviolet and x-ray spacecraft, perched in orbit far above Earth's opaque atmosphere, map distant sources of potent radiation emitted by previously unknown exotic astronomical objects; these are not merely passive probes like pioneering satellites that marked the dawn of the Space Age, but whole observatories remotely operated by teams of scientists, much like...