1.) We see nothing but the past. Some of it is very recent, but it's the past.
2.) Science is constantly reevaluating their preconceived notions of the planets and the universe as we send probes to look more closely.
3.) We rely on the idea that future observations of the planets are close to those made in the last 100 years, before we went.
4.) When we get there, we find a good our forecasting has been wrong, and observations show "inexplicable" facts.
5.) We can't go into the relatively distant past to look at say, dinosaurs. We can only observe their bones and project, much as we do with the planets, before we go.
6.) Despite the clear and poor track record of predictions vs actual results in exploration, we still doggedly hang onto evolutionary theories, which are conveniently beyond direct observation, and therefore, proof.
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