NASAさんのインスタグラム写真 - (NASAInstagram)「Why is the sky blue? This age-old question may not be unique to Earthlings after all. ⁣ ⁣ Though its surface may look like many a barren terrain in our solar system, this image actually depicts the sapphire haze around Pluto. ⁣ ⁣ 😮💙🎨⁣ ⁣ Colors, both those the human eye can see and those measured by other instruments, tell scientists a lot about the distant worlds they are viewing. Like on our own planet, a blue sky often results from the scattering of sunlight by very small particles in the atmosphere. What blocks light out in space can be just as important. If you follow the outline of the planet very closely, you can even see topographical features like mountains illuminated on the top right (near the 4 o’clock position). ⁣ ⁣ Image Credit: NASA/@johnshopkinsapl/@souhwestresearchinstitute⁣ ⁣ #NASA #pluto #solarsystem #blueskies #science」1月3日 6時55分