number of planets in the Solar System

What is the number of planets (substantial body that orbits a star and doesn't orbit another planet - i.e. not a satellite) that satisfy: X is an astronomical object within the larger one The Solar System, consisting of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago

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Show reasoning Reasoning

I followed this chain of reasoning:

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is May 26th 2013, 03:57:13

I know from locally stored knowledge that:
Fact 1: facts of the form: X is within the astronomical object the Solar System (where X is an instance of planet) is an extended fact pattern with order 8 ([fact: ["137144661@trueknowledge.com"]])

Fact 1 is true for August 24th 2006 onwards ([fact: ["137144662@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 1 is true at May 26th 2013, 03:57:13

I used the following facts to provide this answer:

facts of the form: X is within the astronomical object the Solar System (where X is an instance of planet) has been an extended fact pattern with order 8 since August 24th 2006

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