DIRECTIONS for the question: Read the passage and answer the question based on it. NOT everything looks lovelier the longer and closer its inspection. But Saturn does. It is gorgeous through Earthly telescopes. However, the 13 years of close observation provided by Cassini, an American spacecraft, showed the planet, its moons and its remarkable rings off better and better, revealing finer structures, striking novelties and greater drama. . . . By and large the big things in the solar system—planets and moons—are thought of as having been around since the beginning. The suggestion that rings and moons are new is, though, made even more interesting by the fact that one of those moons, Enceladus, is widely considered the most promising site in the solar system on which to look for alien life. If Enceladus is both young and bears life, that life must have come into being quickly. This is also believed to have been the case on Earth. Were it true on Enceladus, that would encourage the idea that life evolves easily when conditions are right. One reason for thinking Saturn’s rings are young is that they are bright. The solar system is suffused with comet dust, and comet dust is dark. Leaving Saturn’s ring system (which Cassini has shown to be more than 90% water ice) out in such a mist is like leaving laundry hanging on a line downwind from a smokestack: it will get dirty. 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. . . . Jeff Cuzzi, a scientist at America’s space agency, NASA, who helped run Cassini, told the Lunar and Planetary Science Conference in Houston that combining the mass estimates with Cassini’s measurements of the density of comet-dust near Saturn suggests the rings are no older than the first dinosaurs, nor younger than the last of them—that is, they are somewhere between 200m and 70m years old. That timing fits well with a theory put forward in 2016, by Matija Cuk of the SETI Institute, in California and his colleagues. 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— Rhea, Dione, Tethys, Enceladus and Mimas. . . . Dr Cuk and his colleagues used computer simulations of Saturn’s moons’ orbits as a sort of time machine. Looking at the rate at which tidal friction is causing these orbits to lengthen they extrapolated backwards to find out what those orbits would have looked like in the past. They discovered that about 100m years ago the orbits of two of them, Tethys and Dione, would have interacted in a way that left the planes in which they orbit markedly tilted. But their orbits are untilted. The obvious, if unsettling, conclusion was that this interaction never happened—and thus that at the time when it should have happened, Dione and Tethys were simply not there. They must have come into being later. . . .
Based on information provided in the passage, we can conclude all of the following except
none of Saturn’s moons ever had suitable conditions for life to evolve.
In an EXCEPT question, three statements can be drawn from the passage and one cannot.
Saturn’s rings were created from the remains of older moons: supported by the 2016 theory that an old set of moons destroyed themselves and the rings and inner moons emerged from their remains.
Lighter rings discolour faster: supported, since "the less mass they contain, the less celestial pollution they can absorb before they start to discolour".
Tethys and Dione are less than 100 million years old: supported, because their orbits would have tilted about 100 million years ago, yet they are untilted, so they "must have come into being later".
The statement that no moon ever had conditions for life contradicts the passage, which calls Enceladus "the most promising site in the solar system" to look for alien life and discusses life evolving there quickly when conditions are right.
Hence, none of Saturn’s moons ever had suitable conditions for life to evolve.
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- In formulating Principle VI (a), the ILC clarified the term "waging of a war of aggression" because:
- The author attributes the growing public frustration with the UN primarily to which pair of continuous failures?
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- According to the critique's conclusion, the immediate, insurmountable barrier preventing the implementation of any reform, major or minor, is:
- The Secretary-General's 'Agenda for Peace' proposed a specific military capability intended to address the gap between traditional peace-keeping and full military action. This proposed unit was explicitly characterized by the summary as being:
