APOD: 2024 June 11 Б Colorful Stars and Clouds near Rho Ophiuchi

Вт, Июнь 11, 2024 - 8:30 / Категория: astronet

Why is the sky near
Antares and
Rho Ophiuchi so colorful, yet dusty?

The colors result from a mixture of objects and processes.

Fine dust -- illuminated by starlight -- produces blue
reflection nebulae.

Gaseous clouds whose atoms are excited by
ultraviolet
starlight produce reddish emission nebulae.

Backlit dust clouds block starlight and so
appear dark.

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