Asteroids are large space objects made of rock and ice. There are hundreds of thousands of asteroids in our solar system. Though we often hear ideas about establishing colonies of humans to live and work on our Moon or our neighboring planet, Mars, some think that sending people to an asteroid would actually be the best colonization option for a number of reasons Low Gravity To begin with, asteroids are often much smaller than planets, so they have lower gravity. When landing a spaceship, the craft would not be pulled as strongly or as forcefully toward the asteroid's surface, making the landing safer than landing on the Moon or Mars; it would also allow a spacecraft to carry much more equipment needed to set up the colony. It would also be easier for the spacecraft to take off again, so the spaceship would need to carry considerably less fuel for the trip back to Earth. Mining Valuable Metals Next some asteroids are rich in valuable elements and precious metals that are relatively rare on Earth, such as gold and platinum. An asteroid colony would be extremely profitable and a good source of these raw materials. The colonists or businesses sponsoring them could more than pay for the cost of their support by mining minerals and sending them back to Earth. Easy to Reach Finally, asteroids are a good option for colonization because some of them would be very easy to reach. There are a number of asteroids that periodically come within or near Earth's orbit Some of them actually get closer to Earth than our Moon. So these asteroids would be much easier and more affordable to get to and get back from than a planet like Mars, which would require a two-year trip in each direction.
In the lecture, the professor don't think it is practical to establish clonies on asteriod.
First and foremost, although the low gravity of asteriod makes it easier to for spacecraft to land and take off, the low gravity also introduces some risks. For example, losing gravity could render humans to lose muscel mass and bone density, which can cause severe health problems. Therefore, low gravity has it downsides that will threat the longterm colonization.
Moreover, it is true some precious metals that are ralitively rare on Earth could be found on asteriods, but it may not be as profitable as expexted. On one hand, the cost of supporting the colonies on asteriods and trasporting the metals could overpass the profit brought by the metals. On the other hand, if the supply of the currently rare metals or minerals increase, it will be likely that the maket price of those metals or mierals will decrease, making the profit uncertain.
Last but not the least, due to the changing distance between the asteriods and Earth orbit, reaching the asteriod easily doesn't mean reaturing to Earth would be that easy. Because some asterios will move away from Eatrh, even farrther than Mars. And when the asteriods move away form Earth, returing the Earth can be a challenge.
Grammar and spelling errors:
Line 1, column 31, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: don't
In the lecture, the professor dont think it is practical to establish clon...
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Line 3, column 94, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
...iod makes it easier to for spacecraft to land and take off, the low gravity also ...
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Line 7, column 122, Rule ID: EN_CONTRACTION_SPELLING
Message: Possible spelling mistake found
Suggestion: doesn't
...rth orbit, reaching the asteriod easily doesnt mean reaturing to Earth would be that e...
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Transition Words or Phrases used:
also, but, first, if, may, moreover, so, therefore, for example, it is true, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 8.0 10.4613686534 76% => OK
Auxiliary verbs: 11.0 5.04856512141 218% => Less auxiliary verb wanted.
Conjunction : 10.0 7.30242825607 137% => OK
Relative clauses : 6.0 12.0772626932 50% => More relative clauses wanted.
Pronoun: 11.0 22.412803532 49% => OK
Preposition: 21.0 30.3222958057 69% => OK
Nominalization: 2.0 5.01324503311 40% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1070.0 1373.03311258 78% => OK
No of words: 214.0 270.72406181 79% => More content wanted.
Chars per words: 5.0 5.08290768461 98% => OK
Fourth root words length: 3.82475343497 4.04702891845 95% => OK
Word Length SD: 2.50521336058 2.5805825403 97% => OK
Unique words: 131.0 145.348785872 90% => More unique words wanted.
Unique words percentage: 0.61214953271 0.540411800872 113% => OK
syllable_count: 323.1 419.366225166 77% => 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: 3.0 8.23620309051 36% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 10.0 13.0662251656 77% => 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: 21.0 21.2450331126 99% => OK
Sentence length SD: 39.9110260454 49.2860985944 81% => OK
Chars per sentence: 107.0 110.228320801 97% => OK
Words per sentence: 21.4 21.698381199 99% => OK
Discourse Markers: 9.4 7.06452816374 133% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 5.0 4.33554083885 115% => OK
Sentences with negative sentiment : 3.0 4.45695364238 67% => OK
Sentences with neutral sentiment: 2.0 4.27373068433 47% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.019575135444 0.272083759551 7% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0095368659947 0.0996497079465 10% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0119540110988 0.0662205650399 18% => Sentences are similar to each other.
Paragraph topic coherence: 0.0147242968689 0.162205337803 9% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.00870048876014 0.0443174109184 20% => 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: 12.8 13.3589403974 96% => OK
flesch_reading_ease: 58.62 53.8541721854 109% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 10.3 11.0289183223 93% => OK
coleman_liau_index: 11.72 12.2367328918 96% => OK
dale_chall_readability_score: 9.11 8.42419426049 108% => OK
difficult_words: 60.0 63.6247240618 94% => OK
linsear_write_formula: 11.0 10.7273730684 103% => OK
gunning_fog: 10.4 10.498013245 99% => OK
text_standard: 11.0 11.2008830022 98% => OK
What are above readability scores?
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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.