Light Years, Red Shift and Blue Shift

Front

What is a light year?

Back

The distance light can travel in a year.

Front

What does it mean if a galaxy is redshifted?

Back

It is moving away from us.

Tags

NGSS.HS-ESS1-2

Front

What are redshift and blueshift used for?

Back

To determine how quickly an object in space is moving and whether it is moving toward or away from Earth.

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-1

Front

What happens to the wavelength of light during blueshift?

Back

The perceived wavelength decreases.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Front

If a star's light is blue-shifted, what does that indicate?

Back

The star is moving towards the Earth.

Tags

NGSS.HS-ESS1-2

Front

What is the speed of light in a vacuum?

Back

Approximately 299,792 kilometers per second (or about 186,282 miles per second).

Tags

NGSS.HS-PS4-1

Front

What is the electromagnetic spectrum?

Back

The range of all types of electromagnetic radiation, including visible light, radio waves, and X-rays.

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Front

What is the Doppler effect?

Back

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

Tags

NGSS.HS-PS4-1

Front

What is the significance of redshift in astronomy?

Back

It helps astronomers determine the distance and speed of galaxies, indicating the expansion of the universe.

Tags

NGSS.HS-ESS1-2

Front

What is blueshift?

Back

A decrease in the wavelength of light from an object moving towards the observer.

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-1