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20 Mar 2019, 22:21
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
47% (01:48) correct
53%
(01:52)
wrong
based on 581
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Even the latest in our technology can detect the presence of water on an exoplanet only if water comprises 10% or more of the total mass of the planet as this technology works by measuring the refraction in light passing through the planet's oceans. We have to wait for at least another decade before we can find a planet which is just as much made of water as the earth is.
Which of the following must be true if the argument above is valid?
A. Much less 10% of the earth's total mass is water.
B. We strongly need to find an exoplanet with just as much water as we have on earth.
C. There are many exoplanets with great amount of water.
D. Water is a prerequisite of life anywhere in the universe.
E. New types of telescope usually appear once in a decade.
Which of the following must be true if the argument above is valid?
A. Much less 10% of the earth's total mass is water.
B. We strongly need to find an exoplanet with just as much water as we have on earth.
C. There are many exoplanets with great amount of water.
D. Water is a prerequisite of life anywhere in the universe.
E. New types of telescope usually appear once in a decade.
22 Mar 2019, 05:15
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Is answer A saying that 90% or less of earth mass could be water. I find it very unspecific.
23 Mar 2019, 01:32
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Option A indicates the opposite of what you have construed. It means that much more than 90% of the earth's total mass is water.
