by 
Chris
ANSWERS: 2
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Jan Oort.
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Over a 100 AU's (astronomical units) from our Sun, bounded by a shell called the heliopause, the edge of interstellar space begins-but not the end of the Sun's realm. The true edge of the Sun's kingdom lies a thousand times more distant still. Here, the Sun clings feebly to a spherical halo of icy Fragments, trillions in numbers - a structure called the Oort Cloud. In 1932, Estonian astronomer Ernst Öpik postulated that long-period comets originated in an orbiting cloud at the outermost edge of the Solar System.[4] In 1950, the idea was independently revived by Dutch astronomer Jan Hendrik Oort as a means to resolve a paradox.
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