Hubble's Law

Astronomer Edwin Hubble discovered (in 1929) that all galaxies are

• rushing toward each other.

• getting larger by galactic mergers

• rushing away from each other.

• spiral in shape

Tags

NGSS.HS-ESS1-2

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

• size.

• mass.

• quasars.

• distance

Tags

NGSS.HS-ESS1-2

A galaxy that is moving toward the earth will have which property?

• Its absorption lines will be very dim.

• Its absorption lines will be blueshifted.

• Its absorption lines will be redshifted.

• Its absorption lines will be very wide.

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-3

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

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

• We see the galaxy as it was when the universe was one billion years old.

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

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

You observe three distant galaxies and note their apparent velocities:

• BFG-01 40,000 km/s
• BFG-02 80,000 km/s
• BFG-03 20,000 km/s

Which of the following is true?

• BFG-01 is farthest away from Earth.

• BFG-02 is closest to Earth.

• BFG-03 is closest to Earth.

• Nothing can be learned from their apparent velocities.

Tags

NGSS.HS-ESS1-2

Our universe is

• expanding.

• shrinking.

• staying the same size.

• We don't know what it's doing.

Tags

NGSS.HS-ESS1-2

How is redshift related to distance?

• The greater the redshift, the less the distance

• The less the redshift, the greater the distance

• The greater the redshift, the greater the distance

• There is no relationship between redshift and distance

Tags

NGSS.HS-ESS1-2

A galaxy is found to be moving away with a speed of 2.1 × 107 m s-1. The galaxy is at a distance of 9.5 × 1024 m from Earth.Assuming the speed has remained constant, what is the age of the universe in years?

• 13.2 Billion

• 14.3 Billion

• 14.1 Billion

• 13.4 Billion

Tags

NGSS.HS-ESS1-4

Hubble's Constant is around...

• 70 Mpc/s/km

• 70 km/s

• 70 km/s/Mpc

• 70 /s

The value of Hubble's Constant is 2.2x10^-18 /s. Calculate the distance from Earth of a Galaxy moving away from us at 160,000m/s

• 3.52x10^-13

• 1.36x10^-23

• 3.7x10^22m

• 7.3x10^22m