Plano topográfico de los Arroyos de Chuy, Sn. Miguel y sus contornos h...
Escala gráfica de 5 millas [= 13 cm]. Longitud occidental del meridiano de Ferro. Orientado con media lis
Mapa de parte de los virreynatos de Buenos Aires, Lima, Sta. Fe y capi...
Shows northwestern South America. "Madrid lo. de marzo de 1796." Relief shown pictorially. Prime meridian: Tenerife. Pen-and-ink and watercolor. Annotated in pencil on verso: N. 18. Available also through the L... More
Solar corona photographed from Apollo 15 one minute prior to sunrise
AS15-98-13311 (31 July 1971) --- The solar corona, as photographed from the Apollo 15 spacecraft about one minute prior to sunrise on July 31, 1971, is seen just beyond the lunar horizon. The bright object on t... More
Shifting Coronas Around Black Holes Artist Concept
A supermassive black hole is depicted in this artist's concept, surrounded by a swirling disk of material falling onto it. The purplish ball of light above the black hole, a feature called the corona, contains ... More