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- Two scientists from the Jet Propulsion
Laboratory (JPL), Donald K. Yeomans and Paul W. Chodas, after determining
the orbit of the asteroid 1997XF11 with greater
precision, announced that the probability that the asteroid would collide
with the Earth is practically nil.
- The Russian scientist Valdimir Polevanov, announced at the beginning
of March in a Russian daily that 1566 Icarus
would crash into the Earth in 2006. His predictions were incorrect.
o Orbital diagram
of asteroid 1566 Icarus.
- In 1992, preliminary calculations on the orbit of the comet Swift-Tuttle
(which was just rediscovered) also alerted the possibility of a collision
with Earth. More information in Skywatch
- More
information on the approach of objects near the Earth predicted
by the IAU for the coming 25 years.
- The hole in the Antarctic ozone was discovered by British
Antarctic Survey. Bulletins showing daily measurements of ozone
from Halley Bay
station. Sherwood Rowland and Mario Molina were the first to show that
CFCs caused serious destruction of the ozone layer. For this and their
contributions to chemistry of ozone, they won the Nobel Prize in Chemistry
in 1995, together with Paul Crutzen, discoverer of the NOx cycle.
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