Coronavirus Coronavirus Coronaviruses are species of virus belonging to the subfamily "Coronavirinae" in the family "Coronaviridae", in the order Nidovirales. Coronaviruses are enveloped viruses with a positive-sense single-stranded RNA genome and with a nucleocapsid of helical symmetry. The genomic size of coronaviruses ranges from approximately 26 to 32 kilobases, the largest for an RNA virus. The name "coronavirus" is derived from the Latin "corona", meaning crown or halo, and refers to the characteristic appearance of virions under electron microscopy (E.M.) with a fringe of large, bulbous surface projections creating an image reminiscent of a royal crown or of the solar corona.
Patera (planetary nomenclature) Patera (planetary nomenclature) Patera (plural: paterae) is an irregular crater, or a complex crater with scalloped edges on a celestial body. Paterae can have any origin (volcanic, impact or other), although majority of them were created by volcanism. The term comes from Latin language, where it refers to a shallow bowl used in antique culture. This term is used in planetary nomenclature: it is a part of the international names of such features. In such names, it is capitalized and stands after the proper given name (e.g., Pillan Patera). Besides that, it can be used as a description term and