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Astronomers are still debating Titan's origin. However, its intriguing atmosphere does provide a hint. Several instruments aboard the Huygens spacecraft measured the isotopes nitrogen-14 and nitrogen-15 in Titan's atmosphere. The instruments revealed that Titan's nitrogen isotope ratio most closely resembles that seen in comets that exist in the remote Oort Cloud--which is a sphere composed of hundreds of billions of icy comet nuclei that circle our Star at the amazing distance of between 5,000 and 100,000 AU. This shell of icy objects extends half way to the nearest star beyond our own Sun.



If you want to measure our solar system, how would you do it? This simplest way is to measure it in light years. For those not familiar with the term, a light-year is the distance that light travels in a vacuum in one year. This is because the distances between stars is so huge that it is otherwise very challenging to imagine them. A light year is exactly 9,460,730,472,580.8 kilometers. Putting this into real world distances, the Milky Way is approximately 100,000 light-years across.



Brilliant, icy short-period comets invade the bright and toasty inner Solar System, far from their frozen domain in the Kuiper Belt. The Kuiper Belt is the reservoir of comet nuclei that is located closest to Earth. Short-period comets rampage into the inner Solar System more frequently than every 200 years. The more distant long-period comets streak into the inner Solar System's melting warmth and comforting light every 200 years--at least--from the Oort Cloud. Because Earth dwells closer to the Kuiper Belt than to the Oort Cloud, short-period comets are much more frequent invaders, and have played a more important part in Earth's history than their long-period kin. Nevertheless, Kuiper Belt Objects (KBOs) are sufficiently small, distant, and dim to have escaped the reach of our scientific technology until 1992.