Front

What is an independent variable?

Back

An independent variable is the factor in an experiment that is manipulated or changed to observe its effects on the dependent variable.

Front

In an experiment testing food's effect on focus, what is the independent variable?

Back

The different food.

Front

What is the independent variable in Randall's experiment with goldfish?

Back

The amount of salt.

Front

What are the three pieces of evidence for the current theory of the universe?

Back

Redshift, CMB (Cosmic Microwave Background), distribution of elements.

Front

What does redshift indicate in astronomy?

Back

Redshift indicates that an object in space is moving away from the observer, often used to determine the expansion of the universe.

Front

What is the significance of the Cosmic Microwave Background (CMB)?

Back

The CMB is the afterglow radiation from the Big Bang, providing evidence for the universe's origin and its expansion.

Front

What does the distribution of elements in the universe suggest?

Back

The distribution of elements supports the Big Bang nucleosynthesis theory, indicating how elements were formed in the early universe.

Front

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

Back

It means that the galaxy is experiencing redshift, indicating the universe is expanding.

Front

Fill in the blank: The universe was too _____ for stars to form immediately after the Big Bang.

Back

Small.

Front

What is the Doppler effect?

Back

The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source.