The scientific explanation that the universe began about 13.8 billion years ago from a single, hot, dense point and has been expanding ever since. It does not describe an explosion in space, but rather an expansion of space itself.

The idea that galaxies are moving away from each other over time, meaning the universe is getting larger. Scientists discovered this by studying the motion of distant galaxies.

When light waves from distant galaxies stretch toward the red end of the spectrum because the galaxies are moving away. Redshift is one of the key pieces of evidenc

Cosmic Microwave Background (CMB)

The faint glow of leftover radiation from the Big Bang that fills all of space. It is considered a 'snapshot' of the early universe.

The observation that the farther away a galaxy is, the faster it is moving away from us. This supports the idea that the universe is expanding in all directions.

The change in the frequency of waves depending on the movement of the source. It explains why galaxies moving away show redshifted light.

A massive system of stars, gas, dust, and dark matter held together by gravity. The Milky Way is the galaxy where Earth is located.

A large cloud of gas and dust in space, often the birthplace of stars. Nebulae help scientists study how elements formed in the universe.

The distance light travels in one year, about 6 trillion miles (9.5 trillion km). Scientists use light-years to measure

The idea that hydrogen and helium are the most common elements in the universe, as predicted by the Big Bang Theory. This evidence matches what scientists observe in stars and galaxies.

Dark or bright lines in the spectrum of light that show which elements are present. Shifts in these lines help scientists measure galaxy movement.

A point in space where density is extremely high and volume is nearly zero. The Big Bang Theory suggests the universe started from a singularity.

The part of the universe we can see with telescopes and instruments. Light from beyond this region hasn’t reached us yet due to the speed of light.

A mysterious form of energy causing the accelerated expansion of the universe. Scientists know it exists because galaxies are moving apart faster than expected.

A well-tested explanation based on evidence, not just a guess. The Big Bang Theory is called a 'theory' because it is supported by multiple lines of evidence.

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Big Bang Theory Voc.

Question	Answer
Big Bang Theory	The scientific explanation that the universe began about 13.8 billion years ago from a single, hot, dense point and has been expanding ever since. It does not describe an explosion in space, but rather an expansion of space itself.
Universe Expansion	The idea that galaxies are moving away from each other over time, meaning the universe is getting larger. Scientists discovered this by studying the motion of distant galaxies.
Redshift	When light waves from distant galaxies stretch toward the red end of the spectrum because the galaxies are moving away. Redshift is one of the key pieces of evidenc
Cosmic Microwave Background (CMB)	The faint glow of leftover radiation from the Big Bang that fills all of space. It is considered a 'snapshot' of the early universe.
Hubbles Law	The observation that the farther away a galaxy is, the faster it is moving away from us. This supports the idea that the universe is expanding in all directions.
Doppler Effect	The change in the frequency of waves depending on the movement of the source. It explains why galaxies moving away show redshifted light.
Galaxy	A massive system of stars, gas, dust, and dark matter held together by gravity. The Milky Way is the galaxy where Earth is located.
Nebula	A large cloud of gas and dust in space, often the birthplace of stars. Nebulae help scientists study how elements formed in the universe.
Light-Year	The distance light travels in one year, about 6 trillion miles (9.5 trillion km). Scientists use light-years to measure
Element Abundance	The idea that hydrogen and helium are the most common elements in the universe, as predicted by the Big Bang Theory. This evidence matches what scientists observe in stars and galaxies.
Spectral Lines	Dark or bright lines in the spectrum of light that show which elements are present. Shifts in these lines help scientists measure galaxy movement.
Singularity	A point in space where density is extremely high and volume is nearly zero. The Big Bang Theory suggests the universe started from a singularity.
Observable Universe	The part of the universe we can see with telescopes and instruments. Light from beyond this region hasn’t reached us yet due to the speed of light.
Dark Energy	A mysterious form of energy causing the accelerated expansion of the universe. Scientists know it exists because galaxies are moving apart faster than expected.
Scientific Theory	A well-tested explanation based on evidence, not just a guess. The Big Bang Theory is called a 'theory' because it is supported by multiple lines of evidence.

Created by: bdenaux

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