I have also reinstated this statement which they removed from the first para The need for planetary protection measures is strongest for missions designed to return a sample from another planet or celestial body to the Earth back contamination again without discussion The sentence was not written by me It could perhaps do with a cn what source actually says this and if the reader wants to follow it up further what did they say exactly Personally I think forward contamination is also pretty important But certainly not removed without discussion like this The rest is merged material from other articles and as I don t think they belong here I don t want to get involved in editing those sections The history section was originally much shorter and immediately after the intro and I don t see the point in the Resilience of life in space section wouldn t put that as the first or indeed any section in an article on Planetary Protection I would just revert the entire thing back to the way it was before WP and BI edited it if it was up to me