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Please edit it:
I'm not denying that art is great, however. History has bestowed us countless art masterpieces which add to the planet's cultural diversity and let us have many colorful experiences. "Unfortunately", so far science has just made a small step on its way of a great crusade. But, like what Neil Armstrong said as he stepped on the moon, “That’s one small step for science, one giant leap for mankind.” It is science that gives us the second sun when darkness falls; it is science that makes our mortals fly in the sky like Jesus Christ; it is science that serves us everywhere and without it we cannot imagine how we would live along. In a word, science is the greatest art in the past, present and future!
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I am not denying that art is important. History has bestowed upon us countless masterpieces of beauty which have added to the world's cultural diversity. However, science has so far taken only a small step on its great crusade. As Neil Armstrong said as he stepped on the moon, 'That’s one small step for (a) man, one giant leap for mankind.' It is science that has given us a second sun when darkness falls; it is science that makes mortals fly in the sky like angels; it is science that serves us everywhere, and we cannot imagine how we would get along without it. In a word, science is the greatest art of the past, present and future!

'Planet' is primarily geophysical; 'world' is more socioanthropological.

Art-- good art-- is seldom if ever considered 'colorful'.

If you are going to present an item as a quote, you should be accurate ('a man', not 'science').

Jesus Christ is not known for flying in the sky.

Also, your argument for 'science as a kind of art' is nonexistent, at least within this extract, Jobb.
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I like it! Thanks for editing.

PS. Could I remove the quotation marks for consistency? It seems reluctant changing "science" to "a man".
The usage of "angels" is very romantic!

I like it! Thanks for editing.

PS. Could I remove the quotation marks for consistency? It seems reluctant changing "science" to "a man".
If you want to do that, I'd suggest a bit more editing, to:

As Neil Armstrong might have said as he stepped onto the moon, 'That’s one small step for science, one giant leap for mankind.'

Then it is clear that not only are you not misquoting accidentally, but are intentionally rephrasing the quotation to stress your point.
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Very cool.
Thank you MM.