sunlight from the Halley nucleus, at its 
known distances from the sun and the 
earth, will tell how big the nucleus must 
be. More accurately, the reflected sun- 
light will provide an estimate of the 
nucleus size that depends on the albedo, 
or reflectivity, of the nucleus. A small, 
light-colored nucleus would reflect more 
sunlight than a larger, darker nucleus. 
Further, the surface texture will affect 
the amount of light reflected in different 
directions. Thus, a nuclear surface cov- 
ered by many tiny particles — whether 
light or dark — would reflect light differ- 
ently from a smooth, icy surface of the 
same light or dark shade. 
Fortunately, the albedo can also be 
measured. In November 1980, Belton 
looked in vain for Halley’s comet and 
concluded that he might have detected 
it had it been as large as sixteen miles in 
diameter. (The Palomar team came to a 
similar conclusion.) That’s no surprise, 
for modem cometary scientists believe 
that the nucleus of even a big comet 
such as Halley may be no more than a 
few miles across although estimates 
published not many years ago were 
larger. Once the coma forms as the 
nucleus approaches the sun. it will be 
- THE rflMfc 
GIFT 
Publishers of The Random House Dictionary 
of the English Language Unabridged Edition 
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