Science: v.1-v.219Moses King, 1967 |
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Стр. 1208
... less than 200 years ; such comets are often loosely referred to as " periodic comets , " although most comets are really periodic . Forty - four periodic comets have been observed only once , 29 of them having periods of less than 9 ...
... less than 200 years ; such comets are often loosely referred to as " periodic comets , " although most comets are really periodic . Forty - four periodic comets have been observed only once , 29 of them having periods of less than 9 ...
Стр. 1253
... less accurate regulator gauge is used . The entire procedure takes less than 30 seconds , and twigs may be severed for at least 5 minutes with- out an increased reading . There are several sources of varia- tion in readings obtained ...
... less accurate regulator gauge is used . The entire procedure takes less than 30 seconds , and twigs may be severed for at least 5 minutes with- out an increased reading . There are several sources of varia- tion in readings obtained ...
Стр. 1501
... less than 1 X 10- , and a probability limit for accidental planetary impact by unsterilized fly - by or orbiting spacecraft of 3 X 10 % or less . A U.S. recommendation to relax the constraint on heat - sterilized Mars land- ers to 1 X ...
... less than 1 X 10- , and a probability limit for accidental planetary impact by unsterilized fly - by or orbiting spacecraft of 3 X 10 % or less . A U.S. recommendation to relax the constraint on heat - sterilized Mars land- ers to 1 X ...
Содержание
Vol 155 No 3765 | 951 |
International Biological Program | 957 |
E M Williams | 974 |
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