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First of all, let's pick something to be the end of the solar system, so that we can agree

on what's in and what's out.

For our first estimate, let's say everything that's double the distance to Pluto is "in".

Pluto's average distance from the sun is listed as 5.91 billion km. Double that is 11.82 billion km

from the sun all around, or a circle that's 23.64 billion km across. The speed of light is 300 million

meters per second. So the diameter of that circle is

23.64 x 1012 / 3 x 108 = 7.88 x 104 light-seconds = 21.9 light-hours = 0.0025 light-years

===========================================

But don't go away. We have to do that calculation one more time.

Just to get an idea of whether our estimate of double-Pluto's-distance is reasonable, we

looked into the TIME/Britannica Almanac 2010, and we were shocked ! This reference says

that the "Oort Cloud" ... a giant spherical cloud of icy, comet-like bodies ... is thought to

orbit the sun at distances out to 1,000 times the orbit of Pluto. If that's true, then we

have to revise our calculation drastically.

Average distance to Pluto: 5.91 billion km

Radius of the Oort Cloud: 5,910 billion km

Diameter of the solar system including the Oort Cloud: 11,820 billion km

Speed of light = 300 million meters per second

Diameter of the solar system at light speed:

1.182 x 1016 / 3 x 108 = 3.94 x 107 light-seconds = 456 light-days = 1.25 light-year

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Q: What is theApproximate width of solar system in light years?
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What is the width of our solar system?

10^-4 light years


To measure the width of your solar system you use what?

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No. Short distances (the width of a planet) are measured in kilometers. Distances from one place to another in our solar system are measured in Astronomical Units (AU), one AU being 93 million miles. Longer distances outside our solar system are popularly measured in light years, Alpha Centauri is 4.2 light years away, for example, but note I said "popularly". Astronomers use the term "parsecs" when speaking of interstellar distances (one parsec is 3.26 light years).


Which space probe has left the solar system?

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Voyager 1 and Voyager 2 have both left the heliosphere, but neither has left the solar system. The edge of the solar system is considered to be the outer boundary of the Oort Cloud, The exact width of the Oort Cloud is not known, but its estimated that it would take Voyager 2 about 300 years to reach the inner boundary of it. To reach the outer boundary of the Oort Cloud, truly leaving the solar system, would take Voyager 2 something like 30,000 years.


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