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  • Unlike cellular organisms, which are all thought to have had one ancestor, viruses are descended from more than one ancestral strain, so it is unlikely that enough virus-laden meteorites landed to seed the "virosphere" we know today.

    New Scientist - Online News

  • If we find life elsewhere, he adds, the absence of a diverse virosphere could suggest that life on Mars, say, might have originated in panspermia.

    New Scientist - Online News


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  • Researchers started exploring the size and diversity of the viral world, or "virosphere", by taking samples from different environments and counting the viruses.

    New Scientist, 30 August 2008

    August 30, 2008