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 Mars and 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 it would add too much weight to the ship.
In this set of material, the writer strongly postulates that sending human astronauts to Mars pose some challenges unlike the moon, and provides three problems to endorse its idea. On the other hand, the speaker mentions that though trip to the mars would be challenging, challenges can be overcome; and gainsays search of it.
First and foremost, the writer begins by asserting that spacecraft to Mars will take at least 2 years, therefore it is preposterous to carry all the food , oxygen, and water supply for such a long time. The lecturer dismisses this point by positioning that food can be grown and cultivates inside the spacecraft using hydroponic technique. this technique will enable the spacecraft to grow crops within small space. Not only they can recycle the waster water and collect the water for drinking purpose, but also humans will get fresh air by this way. Therefore, this problem could be solved.
Furthermore, the lecturer posits that until now several space station were sent to the space before this trip to the mars, hence there is a solution to manage the zero-gravity problem that was learnt from previous experiences. He exemplify that using vitamins such as Calcium will reduce the bone density problem, and doing exercise would solve the muscle mass from declining. These claims clearly refutes the writer's implication that astronuats in the mars have to overcome the problem of muscle mass and bone density reduction in zero gravity environment of Mars.
Ultimately, the writer wraps its arguments by declaring that humans in the mars are exposed to the dangerous sun radiation and they cannot use any heavy shield to prevent themselves. Not surprisingly, the speaker takes an issue with this by contending that astronauts are not continuously exposed to the dangerous radiations. Though it does happen but it happens rarely, astronauts can detect that radiation using light equipment and prevent them from these rays by staying inside the shield and once radiation are overpass then they can come outside the shield. This method could solve the radiation problem.
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Grammar and spelling errors:
Line 2, column 154, Rule ID: COMMA_PARENTHESIS_WHITESPACE
Message: Put a space after the comma, but not before the comma
Suggestion: ,
...it is preposterous to carry all the food , oxygen, and water supply for such a lon...
^^
Line 2, column 340, Rule ID: UPPERCASE_SENTENCE_START
Message: This sentence does not start with an uppercase letter
Suggestion: This
... spacecraft using hydroponic technique. this technique will enable the spacecraft to...
^^^^
Line 3, column 201, Rule ID: HE_VERB_AGR[1]
Message: The pronoun 'He' must be used with a third-person verb: 'exemplifies'.
Suggestion: exemplifies
...as learnt from previous experiences. He exemplify that using vitamins such as Calcium wil...
^^^^^^^^^
Line 3, column 381, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'writers'' or 'writer's'?
Suggestion: writers'; writer's
...ining. These claims clearly refutes the writers implication that astronuats have to ove...
^^^^^^^
Line 4, column 355, Rule ID: ADVERB_WORD_ORDER[9]
Message: The adverb 'rarely' is usually put before the verb 'happens'.
Suggestion: rarely happens
...adiations. Though it does happen but it happens rarely, astronauts can detect that radiation u...
^^^^^^^^^^^^^^
Transition Words or Phrases used:
also, but, first, furthermore, hence, if, so, then, therefore, at least, such as, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 11.0 10.4613686534 105% => OK
Auxiliary verbs: 14.0 5.04856512141 277% => Less auxiliary verb wanted.
Conjunction : 13.0 7.30242825607 178% => OK
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 32.0 22.412803532 143% => Less pronouns wanted
Preposition: 36.0 30.3222958057 119% => OK
Nominalization: 10.0 5.01324503311 199% => OK
Performance on vocabulary words:
No of characters: 1724.0 1373.03311258 126% => OK
No of words: 331.0 270.72406181 122% => OK
Chars per words: 5.2084592145 5.08290768461 102% => OK
Fourth root words length: 4.26537283232 4.04702891845 105% => OK
Word Length SD: 2.6228074434 2.5805825403 102% => OK
Unique words: 197.0 145.348785872 136% => OK
Unique words percentage: 0.595166163142 0.540411800872 110% => OK
syllable_count: 521.1 419.366225166 124% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 5.0 3.25607064018 154% => OK
Article: 7.0 8.23620309051 85% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 5.0 1.51434878587 330% => Less conjunction wanted as sentence beginning.
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 14.0 13.0662251656 107% => OK
Sentence length: 23.0 21.2450331126 108% => OK
Sentence length SD: 56.4088573158 49.2860985944 114% => OK
Chars per sentence: 123.142857143 110.228320801 112% => OK
Words per sentence: 23.6428571429 21.698381199 109% => OK
Discourse Markers: 7.07142857143 7.06452816374 100% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 5.0 4.19205298013 119% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 6.0 4.45695364238 135% => OK
Sentences with neutral sentiment: 4.0 4.27373068433 94% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.0916245405728 0.272083759551 34% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0292797626794 0.0996497079465 29% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0356613438844 0.0662205650399 54% => OK
Paragraph topic coherence: 0.0581471317314 0.162205337803 36% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.035828778728 0.0443174109184 81% => OK
Essay readability:
automated_readability_index: 14.9 13.3589403974 112% => OK
flesch_reading_ease: 48.13 53.8541721854 89% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 12.3 11.0289183223 112% => OK
coleman_liau_index: 13.23 12.2367328918 108% => OK
dale_chall_readability_score: 9.02 8.42419426049 107% => OK
difficult_words: 89.0 63.6247240618 140% => OK
linsear_write_formula: 13.5 10.7273730684 126% => OK
gunning_fog: 11.2 10.498013245 107% => OK
text_standard: 14.0 11.2008830022 125% => OK
What are above readability scores?
---------------------
Write the essay in 20 minutes.
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.