Big Bang Theory Review

What can the spectrum of a star tell us?

• Age of the star
• Star's chemical composition
• Star's elements
• Star's chemical composition & elements

As a light source (star) is moving away from the observer, the light becomes __________

• Greener
• Yellower
• Redder
• Bluer

What law states that the galaxies are retreated from the Milky Way at a speed that's proportional to their distance?

• Hubble's Law
• Newton's 1st Law
• Einstein's Theory of Relativity
• Kepler's 2nd Law

What have astronomer's concluded based on the observed red shifts in the spectral lines of distant galaxies?

• Universe is getting smaller
• Universe is expanding
• Universe size isn't changing

How old is our universe according to the Big Bang Theory?

• We don't know
• 15 billion years
• 13.7 billion years
• 11 billion years

Cosmic background radiation is remnants of the _______.

• big bang

• solar flare

• supernova

• none of the above

Our universe is made of ________ hydrogen

• 25%

• 35%

• 74%

• 82%

The universe being composed of 74% hydrogen and 25% helium is evidence of the Big Bang Theory.

• True

• False

If a star is being observed from Earth and it's light has shifted towards the red side of the electromagnetic spectrum it would be...

• Moving towards the Earth

• Moving away from the Earth

• This is a trick question that cannot be answered

• It isn't a star, it is a very large blueberry.

The vast majority of galaxies in our universe are moving away from us.  We know this because we observe __________ in the galaxies absorption spectra.

• Redshift
• Blueshift
• Turbulance
• Superposition