You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "average distance from earth to sun in kilometers?" whose answer is about 150 million.
Each document should contain about 30 words, and these documents should contain useful information.

Query: average distance from earth to sun in kilometers
Useful Output:

Doc 1: 1 light year = 9,460,000,000,000 km. The average distance between Earth and Sun is 1.496 × 10⁸ km. Is the distance between Earth and the Sun
Doc 2: One astronomical unit is the approximate mean distance between Earth and the sun. It's about 93 million miles (150 million km), or 8 light-minutes.
Doc 3: An astronomical unit (abbreviated as AU, au, a.u., or ua) is a unit of length equal to about 149,597,870.7 kilometres (92,955,807.3 mi) or
Doc 4: An Astronomical Unit (AU) is the average distance between Earth and the Sun, which is about 93 million miles or 150 million kilometers.
Doc 5: Earth's mean distance from the Sun at perihelion is 0.9832899 AU (147,098,074 km). Extreme Intervals Between Perihelions of Earth: 1901 to 2000.