NASA's Solar Dynamics Observatory (SDO) has captured a giant dark line snaked across the lower half of the Sun - longer than 67 Earths lined up in a row.The line is, in fact, an enormous swatch of colder material hovering in the sun's atmosphere, the corona, the US space agency said in statement.SDO shows colder material as dark and hotter material as light.Stretched out, that line - or solar filament as scientists call it - would be more than 533,000 miles long.Filaments can float sedately for days before disappearing.
Sometimes they also erupt out into space, releasing solar material in a shower that either rains back down or escapes out into space, becoming a moving cloud known as a coronal mass ejection (CME).SDO captured images of the filament in numerous wavelengths, each of which helps highlight material of different temperatures on the sun.By looking at such features in different wavelengths and temperatures, scientists learn more about what causes these structures, as well as what catalyses their occasional eruptions.