Scientists are considering the possibility of sending humans to Mars in the coming decades. Although there have been successful manned missions to the Moon in the 1960s and 1970s, Mars is 150 times further away from Earth than the Moon is. Thus the project of sending humans to Mars would require solving an array of problems the Moon missions did not have to face.
One problem is that a round-trip to Marsand back is likely to take at least two years. The trip to the Moon lasted only a few days, and it was easy to bring enough supplies of food, water, and oxygen; but the cargo capacity of space vehicles is too limited to put on board the food, water, and oxygen required by a crew for a period of two years. Without those essentials, though, a Mars mission is impossible.
A second problem is that astronauts on the Mars mission would be in the zero-gravity environment of space for many months at a time. Spending a long time in the zero-gravity environment has negative effects on the human body, such as decreased muscle mass and lower bone density. Over the course of a two-year mission, the effects would be so severe, they would make it impossible for humans to make the trip without experiencing grave medical problems
Finally, astronauts on a mission to Mars would be exposed to dangerous levels of space radiation, much of which comes in the form of charged particles emitted by the Sun. Earth's magnetic field, which normally protects us from dangerous solar radiation, would not be able to protect a spaceship traveling in interplanetary space. Constructing a shield that would protect the whole spaceship from space radiation is at present impossible because if would add too much weight to the ship.
In the lecture, the professor is skeptical about the idea in the idea in the reading passage that it is impossible for human to travel to Mars. The professor argues that the problems it propose have been solved.
In the passage, the author argues that the space vehicles are too small to carry essential supplies for two years, like the food, water and oxygen. But the professor says that a new kind of technical device can solve this problem. It can plant vegetables in water instead of soil therefore save much space. It can also collect vapor and make it drinkable, and it can also release oxygen.
The professor then oppose the idea in the reading passage that zero-gravity environment is harmful to human because it can cause lower muscle mass and lower bone density. The professor states that people have found out some ways to prevent this from happening. People can do exercise avoid muscle mass decreasing, and there are some other ways to avoid lower bone density.
Finally, the professor disapprove the idea in the reading passage that space radiation is dangerous for human and a shield would be too heavy. The professor points out that the radiation is only dangerous in a short time in a period, so people can put the shield outside the spaceship only for a short time.
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Grammar and spelling errors:
Line 1, column 187, Rule ID: IT_VBZ[1]
Message: Did you mean 'proposes'?
Suggestion: proposes
...e professor argues that the problems it propose have been solved. In the passage, the ...
^^^^^^^
Transition Words or Phrases used:
also, but, finally, so, then, therefore, kind of
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 9.0 10.4613686534 86% => OK
Auxiliary verbs: 8.0 5.04856512141 158% => OK
Conjunction : 7.0 7.30242825607 96% => OK
Relative clauses : 8.0 12.0772626932 66% => More relative clauses wanted.
Pronoun: 17.0 22.412803532 76% => OK
Preposition: 23.0 30.3222958057 76% => OK
Nominalization: 3.0 5.01324503311 60% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1063.0 1373.03311258 77% => OK
No of words: 224.0 270.72406181 83% => More content wanted.
Chars per words: 4.74553571429 5.08290768461 93% => OK
Fourth root words length: 3.86867284054 4.04702891845 96% => OK
Word Length SD: 2.38230197985 2.5805825403 92% => OK
Unique words: 112.0 145.348785872 77% => More unique words wanted.
Unique words percentage: 0.5 0.540411800872 93% => More unique words wanted or less content wanted.
syllable_count: 341.1 419.366225166 81% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Article: 7.0 8.23620309051 85% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 3.0 1.51434878587 198% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 11.0 13.0662251656 84% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 20.0 21.2450331126 94% => OK
Sentence length SD: 36.7679792417 49.2860985944 75% => OK
Chars per sentence: 96.6363636364 110.228320801 88% => OK
Words per sentence: 20.3636363636 21.698381199 94% => OK
Discourse Markers: 4.36363636364 7.06452816374 62% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 2.0 4.33554083885 46% => More positive sentences wanted.
Sentences with negative sentiment : 8.0 4.45695364238 179% => OK
Sentences with neutral sentiment: 1.0 4.27373068433 23% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.0462504098267 0.272083759551 17% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0210697735458 0.0996497079465 21% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0241849442624 0.0662205650399 37% => Sentences are similar to each other.
Paragraph topic coherence: 0.0322977393551 0.162205337803 20% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0208685616392 0.0443174109184 47% => Paragraphs are similar to each other. Some content may get duplicated or it is not exactly right on the topic.
Essay readability:
automated_readability_index: 11.1 13.3589403974 83% => Automated_readability_index is low.
flesch_reading_ease: 59.64 53.8541721854 111% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.9 11.0289183223 90% => OK
coleman_liau_index: 10.27 12.2367328918 84% => OK
dale_chall_readability_score: 7.73 8.42419426049 92% => OK
difficult_words: 44.0 63.6247240618 69% => More difficult words wanted.
linsear_write_formula: 7.5 10.7273730684 70% => OK
gunning_fog: 10.0 10.498013245 95% => OK
text_standard: 10.0 11.2008830022 89% => OK
What are above readability scores?
---------------------
It is not exactly right on the topic in the view of e-grader. Maybe there is a wrong essay topic.
Rates: 3.33333333333 out of 100
Scores by essay e-grader: 1.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.