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?
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.