Hubble's Law and expanding universe

Hubble's Law states that galaxies are receding away from us at a speed that is proportional to their

• size

• mass

• wavelength

• distance

Tags

NGSS.HS-ESS1-2

Hubble's Law enables astronomers to estimate the distance to a galaxy if they can determine that galaxy's

• mass

• temperature

• spectral type

• velocity of recession

Tags

NGSS.HS-ESS1-2

According to Hubble's Law, more rapidly moving galaxies are now

• closer to us

• accelerating rapidly

• further away from us

• being pulled into black holes

What is the explanation for the high redshifts observed in distant objects

• They are rapidly moving away from us.

• Their light has been gravitationally redshifted.

• Their light has lost energy over time while traveling this distance.

• In the time it took their light to reach us, the universe expanded and, thus, their wavelengths.

A star that is moving toward the earth will have which of the following?

• Dim lines

• Unshifted lines

• Red shifted lines

• Blue shifted lines

Tags

NGSS.HS-PS4-3

You observe two galaxies. galaxy X has a recessional velocity of 1000 km/s while galaxy Y has a recessional velocity of 2000 km/s. Based on this information, which of the following is true?

• galaxy X is 4 times as far away as galaxy Y

• Galaxy Y is 4 times as far away as galaxy X

• Galaxy X is 2 times as far away as galaxy Y

• Galaxy Y is 2 times as far away as galaxy X

According to Hubble's Law, if galaxy B is three times farther away from us than galaxy A, then galaxy B will

• move toward us nine times faster than A

• move toward us three times faster than A

• move away from us nine times faster than A

• move away from us three times faster than A

A galaxy is at a of one billion light years. Which of the following is true?

• We see the galaxy the way it will be in one billion years.

• We see the galaxy the way it was one billion years ago.

• We see the galaxy the way it was when the Universe was one billion years old

• We see what our galaxy will be like in one billion years.

All galaxies are moving away from us

• True

• False

Tags

NGSS.HS-ESS1-2

What is the distance to a galaxy that has a velocity of 10³ km/s if H₀=60km/s/Mpc?

• 10.4 Mpc

• 16.7 Mpc

• 19.1 Mpc

• 22.2 Mpc