Hubble's Law

The theory that the universe is expanding is supported by the

• blue shift of light from distant galaxies

• red shift of light from distant galaxies

Tags

NGSS.HS-ESS1-2

Base your answer to the following question on the diagram below representing the bright-line spectrum (fingerprint) for an element.

The spectrum of the same element observed in the light from a distant star is shown below.

The shift in the spectral lines (fingerprint) indicates that the star is moving

• toward Earth

• away from Earth

Tags

NGSS.HS-ESS1-4

The red shift of visible light waves that is seen by astronomers on Earth is used to determine the

• sizes of nearby galaxies

• movement of distant galaxies

Tags

NGSS.HS-ESS1-2

The diagram below shows the spectral lines for an element.

Which diagram best represents the spectral lines of this element when its light is observed coming from a star that is moving away from Earth?

• 
• 
• 
• 

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-1

When viewed from Earth, the light from very distant galaxies shows a red shift. This is evidence that these distant galaxies are

• moving away from Earth

• moving toward Earth

Tags

NGSS.HS-ESS1-2

The diagram shows a standard spectrum (the star’s fingerprint) compared to a spectrum produced from a distant star.

Which conclusion can be made by comparing the standard spectrum to the spectrum produced from this distant star?

• The star’s spectral lines have shifted toward the blue end of the spectrum and the star is moving toward Earth.

• The star’s spectral lines have shifted toward the blue end of the spectrum and the star is moving away from Earth.

• The star’s spectral lines have shifted toward the red end of the spectrum and the star is moving toward Earth.

• The star’s spectral lines have shifted toward the red end of the spectrum and the star is moving away from Earth.

In the diagram, the spectral lines (fingerprint) of hydrogen gas from three galaxies, A, B, and C, are compared to the spectral lines of hydrogen gas observed in a laboratory.

What is the best conclusion that can be made about the movement of galaxies A, B, and C?

• Galaxy A is moving away from Earth, but galaxies B and C are moving toward Earth.

• Galaxy B is moving away from Earth, but galaxies A and C are moving toward Earth.

• Galaxies A, B, and C are all moving toward Earth.

• Galaxies A, B, and C are all moving away from Earth.

Tags

NGSS.HS-ESS1-2

In a Doppler red shift, the observed wavelengths of light from distant space objects appear closer to the red end of the spectrum than light from similar nearby space objects. The explanation for the red shift is that the universe is presently

• Getting smaller

• Expanding

• Not changing in size

Tags

NGSS.HS-ESS1-2

The more that the spectral lines of a star are shifted to the red end of the spectrum

• the larger it is.

• the hotter it is

• the faster it is moving away from us

Tags

NGSS.HS-ESS1-2

If we observe a Doppler blue shift from a star, the star must be

• moving away from us

• moving toward us

Tags

NGSS.HS-PS2-1

NGSS.HS-PS4-3