Why did God create other planets?

I wonder why God created other planets in addition to Earth.

This side of eternity, we cannot know. However, one reason may be that God knew that we would develop the ability to explore outer space and seek scientific truth about the natural universe. Since the search for all truth ultimately ends in God who is the Way, the Truth, and the Life, perhaps such exploration of outer space contributes in some way to our knowledge of God himself.

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