I'm taking a university Astronomy course, and I must say it's really fun to read about this field.
Anyway, I remember the JWs used to use Jupiter (and probably still do) as an example for how unique and special our solar system is (and thus designed) -- namely, that Jupiter protects the earth from astroids, comets, and meteors. Convincing if one doesn't know any better, especially circa 1994 when Jupiter stepped in front of a comet for us... but this isn't the full story! For example, Deborah Byrd on the astronomy website EarthSky mentions:
But Jupiter creates both good and bad conditions for earthly life. Consider that its powerful gravity prevented space rocks orbiting near it from coalescing into a planet, and that’s why our solar system today has an asteroid belt, consisting of hundreds of thousands of small flying chunks of debris.
Today, Jupiter’s gravity continues to affect the asteroids – only now it nudges some asteroids toward the sun, where they have the possibility of colliding with Earth.
So Jupiter sometimes use it's gravitational pull as a sling shot aiming rocks towards earth! That doesn't sound like particularly good design now does it? If the solar system was created, then wouldn't a perfect god have seen to it that his invader defense system doesn't sometimes cause the very problem it was "meant" to protect against?
Works Cited:
Byrd, Deborah. “Is It True That Jupiter Protects Earth?” EarthSky, EarthSky, 25 Nov. 2015, earthsky.org/space/is-it-true-that-jupiter-protects-earth. Accessed 10 July 2017.