Written by Susan Hendrix
NASA’s Goddard Space Flight Center
Greenbelt, MD – A comet’s journey through the solar system is perilous and violent. A giant ejection of solar material from the sun could rip its tail off.
Before it reaches Mars — at some 230 million miles away from the sun — the radiation of the sun begins to boil its water, the first step toward breaking the comet apart.
And, if it survives all this, the intense radiation and pressure as it flies near to the surface of the sun could destroy it altogether.
[youtube]https://www.youtube.com/watch?v=0IxM_9AVaXc[/youtube]
Comet ISON is on such a journey. It began its trip from the Oort Cloud region of our solar system and is now traveling toward the sun.
The comet will reach its closest approach to the sun on Thanksgiving Day — November 28th, 2013 — skimming just 730,000 miles above the sun’s surface.
If it comes around the sun without breaking up, the comet will be visible in the Northern Hemisphere with the naked eye, and from what we know now ISON is predicted to be a particularly bright and beautiful comet.
Even if the comet does not survive, tracking its journey will help scientists understand what the comet is made of, how it reacts to its environment, and what this explains about the origins of the solar system. Closer to the sun, watching how the comet and its tail interact with the vast solar atmosphere can teach scientists more about the sun itself.
More on Comet ISON: www.nasa.gov/ison
