Exam 14: Modern Cosmology

The night sky is dark because the Universe is not infinitely old.

Observations of type Ia supernovae reveal that the expansion of the universe is speeding up because of the presence of ___________ in empty space.

The cosmological principle states that any observer in any galaxy will see the same general features of the Universe.

If the average density of the universe is less than the critical density, the Universe is open.

Dark energy is the name of the

Which of the following types of Universe has no center and no edge

The rate of expansion of the Universe is currently increasing.

The deuterium and lithium-7 in distant quasars and in the interstellar medium suggests that the Universe is open.

As the Universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as

How can the big bang still be found even though you may not be able to see it with your eyes In what band of the electromagnetic spectrum has it been detected

The initial high-temperature, high-density state from which time starts is known as the ___________.

How might we tell whether the Universe is open or closed