Yeffces Observatory 
comet’s orbit) in February 1986. During 
1985-86, the comet will be observed 
worldwide by NASA’s International 
Halley Watch, a coordinated program 
of measurements and photographs by 
optical and radio telescopes strategically 
located to maintain an hour-by-hour sur- 
vey of Halley’s changing form and spec- 
tral emissions. Astronauts may pilot the 
Space Shuttle in a low Earth orbit as on- 
board telescopes focus on the ultraviolet 
radiation from the comet. Ultraviolet 
rays carry much information about 
cometary atoms and molecules, but can- 
not penetrate the earth’s atmosphere 
and thus must be observed from space. 
If all goes well, the Space Telescope, a 
large, free-flying spacecraft earning the 
most powerfully equipped telescope 
ever made, will be dropped into Earth 
orbit by the Space Shuttle in mid-1985. 
It too will observe Halley’s comet. 
The most exciting plans, however, in- 
volve the first attempts to send space 
vehicles to fly past the comet. At least 
three missions to be launched toward 
Halley’s comet are currently in the 
works: one to be controlled by the Soviet 
Union, one by the Japanese, and one by 
the European Space Agency. The So- 
viet mission apparently comprises two 
spacecraft, which will fly to Halley by 
way of the planet Venus. The other 
missions involve one spacecraft each. As 
this column was being written in early 
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