Recent work with type I supernovae at great distances suggests the universe may in fact be accelerating its expansion, a discovery attributed to a newly found:
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dark energy.
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In our best current theory, the first quasars formed about:
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13 billion years ago.
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In the critical universe now proposed, the ratio of matter/energy is about:
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27:73.
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The two teams involved in the discovery of the cosmic microwave background radiation were at:
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Bell Labs and Princeton.
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What temperature has the Big Bang has cooled to by now?
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Just over 2.7K
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The discovery of the cosmic microwave background was important because:
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it was experimental verification of a prediction from the Big Bang theory.
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According to the main sequence turn-off points of the oldest globular clusters, they are about:
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12 billion years old.
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The photons from the microwave background have not interacted with matter since the universe was how old?
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400,000 years old
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When the microwave background radiation was emitted, about how big was the universe?
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1/1,000 its currents size
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The Hubble time is expressed as:
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1/H.
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According to the microwave background radiation Earth is:
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moving at about 380 km/s toward Leo.
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The cosmic microwave background is:
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blueshifted in the direction of Earth's motion.
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While a variety of factors can produce redshifts in the spectrum, the one associated with the expansion of the universe is called:
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cosmological.
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The redshift of the galaxies is correctly interpreted as:
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space itself is expanding with time, so the photons are stretched while they travel through space.
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What does Hubble's law imply about the history of the universe?
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The universe had a beginning and has expanded since, giving it a finite age.
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The presently accepted value of the Hubble constant gives an age of:
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14 billion years.
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