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.
The reading passage holds a view that there are several problems considering the Moon mission while the listening passage argues that it is a feasible project.
To begin with, the reading passage mentions that the time spent on finishing this project is too long to support a crew's survival. This idea was rejected by the listening section because humans nowadays can cultivate a kind of plant of which the root grows in water instead of soil. This kind of plant requires much smaller space to grow. It can also recycle the water used in the spacecraft and supply the crew with fresh water. Since the plant can use the water to grow and release oxygen through the photosynthesis process, it also solves the oxygen problem.
The reading passage also tries to convince us that the zero-gravity faced by the astronauts is a serious problem. This idea has been cast doubts on immediately by the professor who mentions that there is already a feasible technique to confront this issue. There are several space-stations where the astronauts have to spend months in. By doing regular exercise, astronauts are able to maintain their muscle mass. Also, by intaking vitamins and minerals like Calcium, astronauts can prevent their bone density from lowering.
Finally, the reading passage states that the radiation in the space will be a threat to the mission. However, the professor clearly indicates that the environment in the space is not always dangerous. The radiation is not activated all the time. Also, by building shield on a small part of the spaceship, the crew can hide in there when the radioactive radiation comes. Plus, by building an instrument which can detect when dangerous radiation is coming, the astronaut tell when to hide in there.
| Post date | Users | Rates | Link to Content |
|---|---|---|---|
| 2020-01-20 | f.jafary66@gmail.com | 80 | view |
| 2020-01-18 | naziii | 3 | view |
| 2020-01-07 | 3dra | 3 | view |
| 2019-12-27 | Amirreza97 | 3 | view |
| 2019-12-16 | jeffhjz | 3 | view |
- Rembrandt is the most famous of the seventeenth-century Dutch painters. However, there are doubts whether some paintings attributed to Rembrandt were actually painted by him. One such painting is known as attributed to Rembrandt because of its style, and 85
- It is important to have rules about the types of clothing that people are allowed to wear at work and at school 60
- Do you agree or disagree with the following statement? Children should be required to help with household tasks as soon as they are able to do so. Use specific reasons and examples to support your answer. 70
- In order to get a higher promotion and salary, many people chose to improve their job performance in two ways. Which one do you prefer? Why?1 To do additional work and assignments2 To actively participate in the group work. 90
- 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 proje 3
Grammar and spelling errors:
Line 3, column 116, Rule ID: POSSESIVE_APOSTROPHE[2]
Message: Possible typo: apostrophe is missing. Did you mean 'crews'' or 'crew's'?
Suggestion: crews'; crew's
...g this project is too long to support a crews survival. This idea was rejected by the...
^^^^^
Transition Words or Phrases used:
also, finally, however, so, while, kind of, to begin with
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 13.0 10.4613686534 124% => OK
Auxiliary verbs: 7.0 5.04856512141 139% => OK
Conjunction : 3.0 7.30242825607 41% => More conjunction wanted.
Relative clauses : 14.0 12.0772626932 116% => OK
Pronoun: 18.0 22.412803532 80% => OK
Preposition: 39.0 30.3222958057 129% => OK
Nominalization: 7.0 5.01324503311 140% => OK
Performance on vocabulary words:
No of characters: 1464.0 1373.03311258 107% => OK
No of words: 292.0 270.72406181 108% => OK
Chars per words: 5.01369863014 5.08290768461 99% => OK
Fourth root words length: 4.13376432452 4.04702891845 102% => OK
Word Length SD: 2.59727255647 2.5805825403 101% => OK
Unique words: 159.0 145.348785872 109% => OK
Unique words percentage: 0.544520547945 0.540411800872 101% => OK
syllable_count: 447.3 419.366225166 107% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 5.0 3.25607064018 154% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 6.0 2.5761589404 233% => Less preposition wanted as sentence beginnings.
Performance on sentences:
How many sentences: 16.0 13.0662251656 122% => OK
Sentence length: 18.0 21.2450331126 85% => The Avg. Sentence Length is relatively short.
Sentence length SD: 32.0468407179 49.2860985944 65% => OK
Chars per sentence: 91.5 110.228320801 83% => OK
Words per sentence: 18.25 21.698381199 84% => OK
Discourse Markers: 3.5625 7.06452816374 50% => More transition words/phrases wanted.
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 8.0 4.45695364238 179% => 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: 0.0525010431042 0.272083759551 19% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0181513946806 0.0996497079465 18% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0244449135409 0.0662205650399 37% => Sentences are similar to each other.
Paragraph topic coherence: 0.0405328739863 0.162205337803 25% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0312001634257 0.0443174109184 70% => OK
Essay readability:
automated_readability_index: 11.3 13.3589403974 85% => Automated_readability_index is low.
flesch_reading_ease: 61.67 53.8541721854 115% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 9.1 11.0289183223 83% => OK
coleman_liau_index: 11.78 12.2367328918 96% => OK
dale_chall_readability_score: 8.26 8.42419426049 98% => OK
difficult_words: 69.0 63.6247240618 108% => OK
linsear_write_formula: 9.0 10.7273730684 84% => OK
gunning_fog: 9.2 10.498013245 88% => OK
text_standard: 9.0 11.2008830022 80% => 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.