急問英文tense 問題

Yes, you have to use past tense. The word "is" should be changed to "was".

However, the word "space" in this sentence does not seem to refer to "the physical universe beyond the earth’s atmosphere". When you check Oxford Dictionaries, the examples shown are always without the article "the" when the meaning is "the physical universe beyond the earth’s atmosphere". Below is an example extracted from Oxford Dictionaries:

"Patrick talks to DrDuncan Steel about the threat of objects in space colliding with Earth."

When there was no space beyond, Mary was still the first person to enter the space.

什麼叫「宜家無左太空」？？？