While I would love to see more manned exploration (nothing can take the place of the human ability to adjust to new situations), I concede that instruments offer a safe and sure way to explore our solar system and beyond. And, while it may not always yield all that a human explorer could discover, it certainly yields enough to offer scientists and others ample resources for years of research. (Sorry for the long-winded answer)

When driving: sunshine vs a cloudy day?