the sun
The Sun is the most important member of our solar system with out it the earth would not be able to survive.
sun
The Sun, it provides light and warmth.
the most important use of solar energy is to make electricity.
All depends on what you consider 'important'. To me, I'd say it's the sun. Without a few of the planets, or asteroids, or comets, or the Kuiper Belt, or the Oort Cloud, you'd still have a Solar System. But without the sun, you wouldn't.
The most important member of a campaign's staff is the fundraiser.
Earth
William Jennings Bryan
The chief of the tribe was the most important member of the tribe. :)
its the brightest planet in the solar system
It is the most distant object known.
Voting on a bill