Mancha oscura en la superficie de la fotosfera que normalmente dura dos meses, ocurren en pares y tienen una penumbra y una umbra.
Sistema de clasificación basado en el brillo aparente de una estrella; no toma en cuenta la distancia y por lo tanto no indica el brillo real de la estrella.
Capa de la atmosphere del Sun situada encima de la photosphere y debajo de la corona; mide aproximadamente 2500 km de ancho y tiene una temperature cercana a 30,000 K en su parte superior.
Proceso mediante el cual los núcleos atómicos pesados se dividen en núcleos más livianos y pequeños.
Núcleo denso y colapsado de una estrella que se forma rápidamente, al mismo tiempo que sus capas exteriores se contraen tiene un radio aproximado de 10 km, una masa de 1.5 a 3 veces la del Sol y contiene principalmente neutrones.
Gráfica que relaciona características estelares: incluyendo la clase, la (mass) masa, la temperature, la magnitude, el (diameter) diametro, y la (Luminosity) luminosidad.
Describe dos estrellas unidas por la gravedad que giran alrededor de un centro común de masa.
Wind (Viento) de partículas cargadas (iones) que fluye a través del sistema solar y comienza como un gas que es despedido a gran velocidad por la corona del Sun.
Restos de una estrella muy densos y pequeños cuya gravedad es tan grande que ni la luz puede escapar de su campo de gravedad.
Arco de gas expulsado de la cromosfera o gas que se condensa en la corona interna del Sol y que se precipita de nuevo sobre su superficie; puede alcanzar temperaturas mayores a los 50,000 K y está asociada a la presencia de manchas solares.
Extensa nube de gas y polvo interestelares que se colapsa en sí misma debido a su propia gravedad, formando un cuerpo condensado caliente que se convertirá en una estrella nueva.
Cambio aparente de la posición de un cuerpo causado por el movimiento del observador.
Verticales
Capa superior de la atmosphere del Sun que se extiende desde la parte superior de la chromosphere y tiene un rango de temperature de la 2 millones K.
Combinación de núcleos livianos para formar núcleos más pesados: sucede en el núcleo del Sol donde las temperaturas y la presión son extremadamente altas.
Cuerpo condensado, caliente, ubicado en el centro de una nebulosa, que se convertirá en una estrella nueva cuando inicien las reacciones de fusión nuclear.
Brillo que tendría un objeto si estuviera a una distancia de 10 pc; sistema de clasificación del brillo estelar que se puede calcular sólo cuando se conoce la distancia verdadera hasta la estrella.
Grupo de estrellas que forman en el firmamento un patrón que semeja un animal, un personaje mitológico o un objeto cotidiano.
Enorme explosion que ocurre cuando estallan las capas exteriores de una estrella.
Violenta erupción de radiación y partículas desde la superficie del Sol que está asociada con las manchas solares.
La ancha banda diagonal de un diagrama H-R que contiene cerca del 90 por ciento de todas las estrellas; contiene desde estrellas calientes y luminosas en la esquina superior izquierda, hasta estrellas frías de brillo débil en la esquina inferior derecha.
Energía que irradia la superficie de una estrella por segundo; se mide en vatios.
Capa más baja de la atmosphere (atmósfera) solar; corresponde a su superficie visible, tiene una temperature promedio de 5800 K y mide aproximadamente 400 km de ancho.
Estrella de neutrones giratoria que exhibe un patrón de pulsaciones.
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