'What are sungrazing comets?' [ISON NASA Space Science ᴴᴰ]

Sungrazing comets are comets that come within 850,000 miles the sun at their nearest approach, a point in their orbit known as "; Some comets approach even closer, in some cases only a few thousand miles above the sun's surface. Credits: NASA ᴴᴰ

Sungrazing comets are comets that come within 850,000 miles the sun at their nearest approach, a point in their orbit known as "perihelion." Some comets approach even closer, in some cases only a few thousand miles above the sun's surface.

Credits: NASA ᴴᴰ

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