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CCI02.02.02.- A Brief History of the Universe: Crash Course Astronomy

PEDRO ÁLVAREZ JIMÉNEZ 5 preguntas

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Preguntas del test (5)

1At the beginning, the universe was
1. AVery cold
2. BVery hot
3. CDenser
2About quarks, it is true that
1. AThey cannot pulled apart
2. BThey are formed by electrons
3. CThey form protons and neutrons
3When the first atoms did appear?
1. A3 minutes after the Big Bang
2. BBefore the 20 minutes after the Big Bang
3. CAtoms have ever existed
4After recombination
1. AElectrons joined to other particles
2. BUniverse was opaque
3. CPhotons were free from electrons
5First stars did appear
1. A400 thousands years after the Big Bang
2. B400 million years after the Big Bang
3. C400 years after the Big Bang