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# QOTD #20 The early universe contained only the lightest elements,

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QOTD #20 The early universe contained only the lightest elements,  [#permalink]

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07 Dec 2017, 10:35
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45% (medium)

Question Stats:

67% (01:25) correct 33% (01:37) wrong based on 172 sessions

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The early universe contained only the lightest elements, hydrogen and helium. Heavier elements, such as carbon, form only in nuclear reactions in stars and are dispersed when the stars explode. A recently discovered gas cloud contained carbon several billion years ago, when the universe was no more than two billion years old.

If the statements above are true, which of the following must, on the basis of them, also be true？

(A)The earliest stars contained only hydrogen.
(B)Some stars were formed before the universe was two billion years old.
(C)The carbon in the gas cloud later formed part of some stars.
(D)No stars identified to date are as old as the gas cloud.
(E)The gas cloud also contained hydrogen and helium.

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Re: QOTD #20 The early universe contained only the lightest elements,  [#permalink]

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08 Dec 2017, 07:58
carcass wrote:
The early universe contained only the lightest elements, hydrogen and helium. Heavier elements, such as carbon, form only in nuclear reactions in stars and are dispersed when the stars explode. A recently discovered gas cloud contained carbon several billion years ago, when the universe was no more than two billion years old.

If the statements above are true, which of the following must, on the basis of them, also be true？

(A)The earliest stars contained only hydrogen.
(B)Some stars were formed before the universe was two billion years old.
(C)The carbon in the gas cloud later formed part of some stars.
(D)No stars identified to date are as old as the gas cloud.
(E)The gas cloud also contained hydrogen and helium.

(1) The ealy universe contained no carbon.
(2) Carbons form only from stars when they explode.
(3) A recently discovered gas cloud contained carbon when the universe was about 2b years ago.

From (3), it's clear that there must be carbons when the universe was about 2b years ago.
Then from (2), there must be stars when the universe was about 2b years ago.
Hence, this comes to choice (B).
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Re: QOTD #20 The early universe contained only the lightest elements,  [#permalink]

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08 Dec 2017, 10:18
The early universe contained only the lightest elements, hydrogen and helium. Heavier elements, such as carbon, form only in nuclear reactions in stars and are dispersed when the stars explode. A recently discovered gas cloud contained carbon several billion years ago, when the universe was no more than two billion years old.

If the statements above are true, which of the following must, on the basis of them, also be true？

(A)The earliest stars contained only hydrogen. -Stars contained carbon as well. Thus this statement is incorrect.
(B)Some stars were formed before the universe was two billion years old. -Correct
(C)The carbon in the gas cloud later formed part of some stars. -We don't know what happened later
(D)No stars identified to date are as old as the gas cloud. -Out of scope
(E)The gas cloud also contained hydrogen and helium. -We don't know the composition of gas cloud
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Re: QOTD #20 The early universe contained only the lightest elements, &nbs [#permalink] 08 Dec 2017, 10:18
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