Question

Data provided by Cassini challenged the assumption that:

• A. Saturn’s ring system is composed mostly of water ice.
• B. there was life on earth when Saturn’s rings were being formed.
• C. new celestial bodies can form from the destruction of old celestial bodies.
• D. all big things in the solar system have been around since the beginning.
• A. establish that Saturn’s rings and inner moons have been around since the beginning of time.
• B. demonstrate how the orbital patterns of Saturn’s rings and moons change over time.
• C. highlight the beauty, finer structures and celestial drama of Saturn’s rings and moons.
• D. provide evidence that Saturn’s rings and moons are recent creations.
• A. methane and rock particles.
• B. helium and methane.
• C. helium and comet dust.
• D. rock particles and comet dust.
• A. atmosphere absorbs comet dust.
• B. rings discolour and darken over time.
• C. rings lose mass over time.
• D. moons create a gap between the rings.
• A. Saturn’s lighter rings discolour faster than rings with greater mass.
• B. Saturn’s rings were created from the remains of older moons.
• C. none of Saturn’s moons ever had suitable conditions for life to evolve.
• D. Thethys and Dione are less than 100 million years old.

Answer 1

The Correct Option is D

The provided data from Cassini effectively contradicts the long-held assumption that all significant celestial bodies in the solar system, such as planets and moons, have been in existence since the solar system's formation. Cassini's observations led to the understanding that Saturn's rings are relatively young, estimated to be between 70 million and 200 million years old. This challenges the presumption that all large structures in the solar system are as ancient as its inception. 

Supporting this, Cassini's findings reveal that Saturn's rings, composed mostly of over 90% water ice, appear bright due to their youth, as they have not yet darkened from space dust accumulation. Furthermore, studies by Matija Cuk et al. suggested the recent formation of Saturn’s rings and current moons like Rhea, Dione, Tethys, Enceladus, and Mimas due to the destruction of a previous set of moons. These insights demonstrate that new celestial bodies can arise from the disintegration of older ones, underscoring the ongoing dynamism within our solar system and refuting the idea that all large celestial structures have existed unchanged since the beginning.

Cassini's Key Findings

Saturn's rings are relatively young.

Rings are over 90% water ice and still bright.

Evidence of new moons forming from old ones.

Planetary processes are ongoing and dynamic.

Hence, the most directly challenged assumption by Cassini's data is that "all big things in the solar system have been around since the beginning."

Answer 2

To determine the main objective of the passage, we need to analyze the content's primary themes and implied conclusions. The passage discusses observations and scientific conclusions regarding Saturn's rings and moons based on data from the Cassini spacecraft. Key elements include:

• The passage initially praises the beauty and complexity revealed by Cassini’s observations of Saturn, its rings, and its moons.

• A hypothesis suggests Saturn’s rings and moons may be recent, due to their brightness and historical estimates of mass absorption and the density of comet dust indicating a younger age for these celestial objects.

• The passage explains a theory by Matija Cuk and his colleagues, using computer simulations, suggesting Saturn’s current inner moons are relatively young, formed from the remnants of older moons approximately 100 million years ago.

The main objective of the passage aligns with the process of establishing that Saturn’s rings and inner moons are relatively young formations. Although there is mention of theories about their potential youth, the broader context emphasizes how observational data has shaped new theories about their existence, challenging the notion they have been around since the solar system's beginning. Therefore, the correct answer to the passage’s main objective is:

establish that Saturn’s rings and inner moons have been around since the beginning of time.

Answer 3

The passage provides insights on Saturn's rings and their composition. It mentions that the rings are primarily composed of over 90% water ice, which is still remarkably bright despite being exposed to the dark comet dust that permeates the solar system. This suggests that, alongside water ice, Saturn's rings are likely to contain comet dust. Further in the passage, reference is made to older moons around Saturn that destroyed themselves, and from their remains, both the rings and the planet's current inner moons formed. This implies the potential presence of rock particles from the remnants of these moons. Therefore, combining the inference from the ring's brightness and the theory regarding moon destruction, it is logical to conclude that, in addition to water ice, Saturn's rings might also have small amounts of rock particles and comet dust.

Answer 4

The correct answer is that the rings of Saturn discolour and darken over time. The comprehension passage explains that Saturn's rings, which consist of over 90% water ice, appear bright. This brightness suggests that the rings are relatively young because the solar system contains comet dust, which is dark. The phrase "leaving laundry hanging on a line downwind from a smokestack" is used metaphorically to illustrate this concept. Just as laundry would get dirty from fallout, the rings get discoloured by absorbing dark comet dust. The lighter the rings are, the faster they accumulate this dust, leading to their discolouration. This comparison helps explain why Saturn's rings have not darkened as much as they would have if they were much older, indicating their relatively young age. Thus, the phrase aligns with the option that the rings discolour and darken over time.

Answer 5

To solve the problem, we should eliminate the options that can be inferred from the given passage and identify the one that cannot.

Step-by-step Analysis:

• Option 1: "Saturn’s lighter rings discolour faster than rings with greater mass."
  • This conclusion can be drawn from the passage, as it states, "The lighter the rings are, the faster this will happen, for the less mass they contain, the less celestial pollution they can absorb before they start to discolour."
• Option 2: "Saturn’s rings were created from the remains of older moons."
  • The passage supports this by mentioning, "They suggest that at around the same time as the rings came into being an old set of moons orbiting Saturn destroyed themselves, and from their remains emerged not only the rings but also the planet’s current suite of inner moons."
• Option 3: "none of Saturn’s moons ever had suitable conditions for life to evolve."
  • The passage implies a contrary idea, stating that Enceladus is "widely considered the most promising site in the solar system on which to look for alien life." Thus, this option is not supported by the passage.
• Option 4: "Thethys and Dione are less than 100 million years old."
  • The passage suggests through simulations that, "at the time when it should have happened, Dione and Tethys were simply not there," implying they are less than 100 million years old.

Therefore, the only option that cannot be concluded from the passage is:

Option 3: "none of Saturn’s moons ever had suitable conditions for life to evolve."