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.
The article and the lecture both discuss whether asteroids are good colonies for humans. The article uses three reasons to support that asteroids are good colonies. However, the lecturer does not agree with that.
According to the article, low gravity can make the landing and taking off of spaceships easier. Moreover, it says that a spacecraft can carry much more equipment needed to set up the colony. Nevertheless, the lecturer addresses some concern. He says that low gravity may also cause some risks. For example, people may lose their muscle mass and their bone density may also decrease. Therefore, low gravity may lead to serious health problems for humans.
Secondly, the article believes that asteroids may be rich in valuable elements and precious metals that can send them back to Earth and make a big fortune. However, the lecturer does not agree with the idea. He thinks that there may be some additional factors that stop them from profiting. For instance, the cost for sending those metals back to Earth may be so high that it reduces the profits. Also, when mining becomes popular, the quantity of the precious metals will rise, and the price will finally fall. Thus, mining those metals may not make people much money.
Grammar and spelling errors:
Line 5, column 305, Rule ID: WHITESPACE_RULE
Message: Possible typo: you repeated a whitespace
Suggestion:
... stop them from profiting. For instance, the cost for sending those metals back t...
^^
Transition Words or Phrases used:
also, finally, however, may, moreover, nevertheless, second, secondly, so, therefore, thus, for example, for instance
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 5.0 10.4613686534 48% => More to be verbs wanted.
Auxiliary verbs: 13.0 5.04856512141 257% => Less auxiliary verb wanted.
Conjunction : 6.0 7.30242825607 82% => OK
Relative clauses : 10.0 12.0772626932 83% => OK
Pronoun: 19.0 22.412803532 85% => OK
Preposition: 14.0 30.3222958057 46% => More preposition wanted.
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: 1037.0 1373.03311258 76% => OK
No of words: 208.0 270.72406181 77% => More content wanted.
Chars per words: 4.98557692308 5.08290768461 98% => OK
Fourth root words length: 3.79765784423 4.04702891845 94% => OK
Word Length SD: 2.27699433848 2.5805825403 88% => OK
Unique words: 119.0 145.348785872 82% => More unique words wanted.
Unique words percentage: 0.572115384615 0.540411800872 106% => OK
syllable_count: 315.0 419.366225166 75% => OK
avg_syllables_per_word: 1.5 1.55342163355 97% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 3.0 3.25607064018 92% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 1.0 1.51434878587 66% => OK
Preposition: 1.0 2.5761589404 39% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 15.0 13.0662251656 115% => OK
Sentence length: 13.0 21.2450331126 61% => The Avg. Sentence Length is relatively short.
Sentence length SD: 28.6353317114 49.2860985944 58% => The essay contains lots of sentences with the similar length. More sentence varieties wanted.
Chars per sentence: 69.1333333333 110.228320801 63% => OK
Words per sentence: 13.8666666667 21.698381199 64% => OK
Discourse Markers: 7.8 7.06452816374 110% => OK
Paragraphs: 3.0 4.09492273731 73% => More paragraphs wanted.
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 7.0 4.33554083885 161% => OK
Sentences with negative sentiment : 5.0 4.45695364238 112% => OK
Sentences with neutral sentiment: 3.0 4.27373068433 70% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.0548209556537 0.272083759551 20% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0221190897392 0.0996497079465 22% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0264995898604 0.0662205650399 40% => Sentences are similar to each other.
Paragraph topic coherence: 0.0434871601788 0.162205337803 27% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0246119799242 0.0443174109184 56% => OK
Essay readability:
automated_readability_index: 9.0 13.3589403974 67% => Automated_readability_index is low.
flesch_reading_ease: 66.74 53.8541721854 124% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 7.2 11.0289183223 65% => OK
coleman_liau_index: 11.07 12.2367328918 90% => OK
dale_chall_readability_score: 8.38 8.42419426049 99% => OK
difficult_words: 54.0 63.6247240618 85% => More difficult words wanted.
linsear_write_formula: 5.5 10.7273730684 51% => Linsear_write_formula is low.
gunning_fog: 7.2 10.498013245 69% => OK
text_standard: 9.0 11.2008830022 80% => OK
What are above readability scores?
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Minimum four paragraphs wanted. The correct pattern:
para 1: introduction
para 2: doubt 1
para 3: doubt 2
para 4: doubt 3
Less contents wanted from the reading passages(25%), more content wanted from the lecture (75%).
Don't need a conclusion paragraph.
Read sample essays from ETS:
http://www.testbig.com/users/toeflwritingmaster
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.