The classification system for organisms has changed from seven levels to eight. this happened because

The modern taxonomic classification system has eight levels as Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

The new level which has been added to the seven levels taxonomic system proposed by the Carolus Linnaeus is "Domain" which is the most inclusive group of system.

The domain system is divided into 3 forms:  archaea, bacteria, and eukaryotes which was introduced by Carl Woese in 1977 were added to the older system which did not show the phylogenetic relationships between organism as prokaryotes were evolved into two groups eubacteria and archaebacteria while eukaryotes are kept a separate group.

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

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