Image of the Sun showing an exceptionally long solar filament, a dark streak of hot gas held aloft by the Sun's magnetic field, extending across a significant portion of the Sun's surface. Captured in hydrogen light, highlighting the chromosphere. This filament is longer than the Sun's radius, measuring over 700,000 kilometers.

Astronomy Picture from 10/02/2015

An Extremely Long Filament on the Sun

Source: https://apod.nasa.gov/apod/ap150210.html


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