Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.
Life in the Universe
Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.
What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.
The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem.
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two.
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth
In order for life to develop, a planet’s orbit must not be______.
A. stable
B. very close to another planet’s orbit
C. on the same planet as another planet’s orbit
D. less wide than the star’s habitable zone.
Đáp án B
Để sự sống có thể phát triển, thì quỹ đạo của một hành tinh không được______.
A. có tính ổn định.
B. quá gần quỹ đạo của một hành tinh khác.
C. trên cùng một hành tinh như quỹ đạo của một hành tinh khác.
D. hẹp hơn phạm vi có sự sống của một ngôi sao.
Dẫn chứng ở 2 câu đầu- đoạn 4: “Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity” – (Đương nhiên là không phải tất cả ngôi sao có kích cỡ phù hợp sẽ phát triển được sự sống, chúng cũng phải có những hành tinh có bề mặt cùng với quỹ đạo phù hợp. Hầu hết những hệ mặt trời đều có nhiều hơn 1 hành tinh, điều đó làm quỹ đạo của chúng tác động lẫn nhau bằng chính lực hấp dẫn của chúng).
=> Để có sự sống thì quỹ đạo của một hành tinh không được quá gần với quỹ đạo của 1 hành tinh khác, không thì chúng sẽ tác động lẫn nhau bằng chính lực hấp dẫn của mình, khiến cho sự sống không thể phát triền