Las Supernovas son colosales explosiones de estrellas masivas cuyos remanentes de gas y polvo enriquecen el medio interestelar de elementos pesados. Son uno de los fenómenos más energéticos del universo, y su intenso brillo, que puede superar al de la galaxia que las aloja, sirve para establecer distancias y la velocidad de expansión del universo.
The National Geographic Society (NGS), headquartered in Washington, D.C., United States, is one of the largest nonprofit scientific and educational organizations in the world. Founded in 1888, its interests include geography, archaeology, and natural science, the promotion of environmental and historical conservation, and the study of world culture and history. The National Geographic Society's logo is a yellow portrait frame—rectangular in shape—which appears on the margins surrounding the front covers of its magazines and as its television channel logo. Through National Geographic Partners (a joint venture with The Walt Disney Company), the Society operates the magazine, TV channels, a website, worldwide events, and other media operations.