Local Focus – Global Reach learn more about Kudos 365

Share, Engage & Explore Our Kudos Community

Posted by Specola

NASA Astronomy Picture of the Day:

The many spectacular colors of the Rho Ophiuchi (oh'-fee-yu-kee) clouds highlight the many processes that occur there. The blue regions shine primarily by reflected light. Blue light from the Rho Ophiuchi star system and nearby stars reflects more efficiently off this portion of the nebula than red light. The Earth's daytime sky appears blue for the same reason. The red and yellow regions shine primarily because of emission from the nebula's atomic and molecular gas. Light from nearby blue stars - more energetic than the bright star Antares - knocks electrons away from the gas, which then shines when the electrons recombine with the gas. The dark brown regions are caused by dust grains - born in young stellar atmospheres - which effectively block light emitted behind them. The Rho Ophiuchi star clouds, well in front of the globular cluster M4 visible here on the upper right, are even more colorful than humans can see - the clouds emits light in every wavelength band from the radio to the gamma-ray. Astrophysicists: Browse 2,200+ codes in the Astrophysics Source Code Library

Photo by Amir H. Abolfath

Show Off Your Work

Join Kudos to share your expertise

Kudos 365 gives you an online platform to showcase your photography and reach a broader audience.

Feedback