Question: Summarize the points made in the lecture, being sure to explain how they respond to the specific points made in the reading passage.
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 speaker and the author hold divergent attitude towards whether Mars is the best option for human's colonization. The writer proposes that Mars has low gravity, is rich in valuable metals and is easy to reach. However, the professor presents his refutation in the lecture.
First, it is said in the reading material that because Mars has low gravity, it is safer for astronomers to land on, and also allows the spacecraft to carry much more equipment. To rebut this idea, the lecture suggests that there are risks brought by the low gravity like losing muscle and lower density. Because of the health problems it poses on human-being, we cannot live in this environment for very long time. Thus, the assumption of the author is severely weakened.
Second, even though the reading passage proposes that there are valuable elements and precious metals on the asteroid, the professor maintains that the cost of excavating those metals and the cost of transporting those metals to the earth are very expensive. In addition when the supply of one metal increases, according to the principle of economics, the price will decrease, and thus the metal company may not earn much money from the business.
Third, the author of the reading material indicates that because some asteroids can come within or near Earth's orbit and can even get closer to Earth than our moon, the trip to the asteroid can be more affordable and easier than other planets, whereas, the lecturer contends that the return will not be easy. Those asteroids do not always stay close to Earth, they are continuously moving in every moment and can move away from the Earth. When the astronomers arrive the asteroid, the distance between the planet and us is close, but when they leave, the distance may be really far.
| Post date | Users | Rates | Link to Content |
|---|---|---|---|
| 2022-08-26 | Liting Mai | 75 | view |
| 2022-01-19 | hellozxc | 71 | view |
| 2020-08-12 | YIngxin Zhang | 80 | view |
| 2020-03-13 | Harperchan1997 | 3 | view |
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Grammar and spelling errors:
Line 5, column 263, Rule ID: SENT_START_CONJUNCTIVE_LINKING_ADVERB_COMMA[2]
Message: Did you forget a comma after a conjunctive/linking adverb?
Suggestion: addition,
...als to the earth are very expensive. In addition when the supply of one metal increases,...
^^^^^^^^
Transition Words or Phrases used:
also, but, first, however, may, really, second, so, third, thus, whereas, in addition
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 15.0 10.4613686534 143% => OK
Auxiliary verbs: 9.0 5.04856512141 178% => OK
Conjunction : 13.0 7.30242825607 178% => OK
Relative clauses : 10.0 12.0772626932 83% => OK
Pronoun: 21.0 22.412803532 94% => OK
Preposition: 32.0 30.3222958057 106% => OK
Nominalization: 8.0 5.01324503311 160% => OK
Performance on vocabulary words:
No of characters: 1488.0 1373.03311258 108% => OK
No of words: 302.0 270.72406181 112% => OK
Chars per words: 4.92715231788 5.08290768461 97% => OK
Fourth root words length: 4.1687104957 4.04702891845 103% => OK
Word Length SD: 2.45770324689 2.5805825403 95% => OK
Unique words: 170.0 145.348785872 117% => OK
Unique words percentage: 0.562913907285 0.540411800872 104% => OK
syllable_count: 459.9 419.366225166 110% => 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: 12.0 8.23620309051 146% => OK
Subordination: 3.0 1.25165562914 240% => Less adverbial clause wanted.
Conjunction: 3.0 1.51434878587 198% => OK
Preposition: 4.0 2.5761589404 155% => OK
Performance on sentences:
How many sentences: 12.0 13.0662251656 92% => OK
Sentence length: 25.0 21.2450331126 118% => OK
Sentence length SD: 71.9523376193 49.2860985944 146% => OK
Chars per sentence: 124.0 110.228320801 112% => OK
Words per sentence: 25.1666666667 21.698381199 116% => OK
Discourse Markers: 7.08333333333 7.06452816374 100% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 5.0 4.33554083885 115% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => 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: 0.101021409233 0.272083759551 37% => The similarity between the topic and the content is low.
Sentence topic coherence: 0.0286605767613 0.0996497079465 29% => Sentence topic similarity is low.
Sentence topic coherence SD: 0.0364133588614 0.0662205650399 55% => OK
Paragraph topic coherence: 0.0481856071402 0.162205337803 30% => Maybe some paragraphs are off the topic.
Paragraph topic coherence SD: 0.0497835857004 0.0443174109184 112% => OK
Essay readability:
automated_readability_index: 14.4 13.3589403974 108% => OK
flesch_reading_ease: 54.56 53.8541721854 101% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 11.9 11.0289183223 108% => OK
coleman_liau_index: 11.61 12.2367328918 95% => OK
dale_chall_readability_score: 8.59 8.42419426049 102% => OK
difficult_words: 71.0 63.6247240618 112% => OK
linsear_write_formula: 10.5 10.7273730684 98% => OK
gunning_fog: 12.0 10.498013245 114% => OK
text_standard: 12.0 11.2008830022 107% => OK
What are above readability scores?
---------------------
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 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.