This is probably more of a soul searching confession than an answer. I do this too. I am always in the look out for new movies, books and quotes of wisdom. I have accumulated such a humongous collection of e-books and movies that I would probably will never be able to finish them if I gave up everything and only binge-watched or binge-read. I keep browsing GoodReads, IMDB, Quora and the likes, for highly rated books , movies, etc.
Answer: There is no oxygen for astronauts to breathe, so spacecraft must be airtight. There is nothing to hold the sun's heat, so objects in space can experience a wide range of temperature.
The diary provides a vivid and poignant glimpse into the world of a young Jewish girl living in Nazi occupied Holland. Its purpose was to teach us what happened and what she lived through.