Composition of Stars/Big Bang Review

Front

What are the two most abundant elements in the visible universe?

Back

Hydrogen and Helium.

Front

What does it mean if a galaxy is moving away from us?

Back

It indicates that the universe is expanding.

Front

What instrument is used to collect visible light and separate it into bands of color?

Back

Spectroscope.

Front

What happens to light waves when objects are moving apart?

Back

They appear more red (redshift).

Front

What does the redshift of light from distant galaxies indicate?

Back

The universe is expanding.

Front

What is the Big Bang Theory?

Back

A scientific explanation for the origin of the universe, stating it began from a singular point and has been expanding ever since.

Front

What is a galaxy?

Back

A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.

Front

What is the difference between a telescope and a spectroscope?

Back

A telescope gathers light to observe distant objects, while a spectroscope separates light into its component colors.

Front

What is cosmic background radiation?

Back

The afterglow radiation from the Big Bang, filling the universe and providing evidence for the Big Bang Theory.

Front

What is the significance of hydrogen in the universe?

Back

Hydrogen is the most abundant element in the universe and is a primary building block for stars.