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I would recommend that you try to omit unnecessary words in your essay. When you're working with academic essays, you will find yourself bound by word counts. This means that you have to try to condense your language. You should also try to be more precise with your language to help your essay become more specific.
For instance, let's take a look at your first paragraph. I can revise the first sentences here as:
Space exploration was created decades ago because of humanity's desire to understand space. However, there are arguments that counter this. Some say that the high cost of space exploration should be allocated in more important projects.Notice how I had divided it into three different sentences to make the structure simpler. Alongside that, I also tried to be more precise with language (ie. changing
a long time ago to
decades ago) to have more formality in the construction of the essay. I have also made sure that I tried to strip down your content (ie. instead of saying
unnecessary huge budget, I just mentioned that it
has a cost) to accommodate more information.
You had were doing the same act of adding unnecessary length to your essay even until your third paragraph. For instance, in the second sentence here, I would have phrased it as:
Technological development fulfills the hunger for discovery, making us realize that we are not alone.Notice how you can get away with removing the first phrase without risking changing what you want to tell the readers about your essay. I would also suggest that you try to implement this strategy elsewhere in the essay where it's necessary.
Best of luck.