Astronomy Picture of the Day
    


A Horizon with Blue and Red
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A Horizon with Blue and Red
Credit & Copyright: Sergio MontĮfar (Planetario Ciudad de La Plata)
Explanation: What's happening on the horizon? The horizon itself, past a spinach field in Guatemala, shows not only trees but a large volcano: the VolcĀn de Fuego (Volcano of Fire). The red glow at the top of the volcano is hot lava. But your eye may also be drawn to the blue circle above the horizon on the left. This circle surrounds the Moon and, together with other colors, is called a corona. A corona is caused by diffraction of light -- here moonlight -- by small water droplets in the Earth's intervening atmosphere. A break in the clouds on the right shows stars and even the planet Saturn far beyond the volcano. Although VolcĀn de Fuego frequently undergoes low-level activity, the astrophotographer considered himself lucky to capture the scene just during an explosive eruption in late September.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: Moon - corona - volcano
Publications with words: Moon - corona - volcano
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