Before humans developed science, we explained what we saw by ___

The study of the physical origins and evolution of the Universe is called ___

Darwin’s Theory of Evolution strongly implied the Earth was how old?

A popular model for the Universe, supported by Einstein, was that it was ___

In the 1910's Vesto Slipher analysed the spectra of “spiral nebulae” and found they were ___

The highly redshifted spectra of nebulae indicated that they were ___

In the 1920s Georges Lemaître proposed on theoretical grounds that the universe was ___

Edwin Hubble and Milton Humason found that the farther away a galaxy was, the faster it was ___

Lemaître imagined everything in the cosmos squeezed into one infinitely dense blob called ___

When the Universe was a tiny dot it would’ve been unimaginably, ___

The sudden expansion of the Universe from a dense point was coined “the Big Bang” by which astronomer?

How long does it take light from the Sun to reach the Earth?

When we look at Alpha Centauri, the nearest star system to us, we see it as it was ___

The farther away something is, the farther in the past we see it. This is called ___

Visible light from the early Universe that reaches us billions of years later should be ___

In what year was the redshifted light from the early Universe first detected by a pair of radio astronomers?

The glow of the fireball leftover from the birth of the cosmos is commonly called the ___

The Big Bang model predicts the observed abundances of certain elements - ratios of them, compared to ___

When we talk about the Universe expanding, we mean ___

From any galaxy, it looks like all the others are ___

Every spot in the Universe appears like the center, which means ___

Currently, the best measurement we have of the age of the Universe is ___