Stars

Compare the two graphs. What can you infer about these stars?

• Star A is more luminous and closer

• Star A is more luminous and farther

• Star B is more luminous and closer.

• Star B is more luminous and farther.

Tags

NGSS.HS-ESS1-3

A Cepheid variable star has an apparent brightness of 85 and a period of 14.3 days. (This means the star is 85 times brighter than the Sun would appear at a distance of 1 Mpc.) About how far away is the star?

• 4.3 Mpc

• 7.7 Mpc

• 10.8 Mpc

• 15.9 Mpc

In the images below, the spectral lines are equivalent. The line at the top is from the Sun. The line below is from a star in a distant galaxy. What is the redshift of the star relative to the Sun?

• -0.00190

• 0.00275

• 0.00381

• 0.00530

Tags

NGSS.HS-ESS1-2

An astronomer records the spectra from three stars in three different galaxies. Which star is probably farthest away?

• Star A

• Star B

• Star C

• Cannot be determined.

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-1

Hubble discovered that the greater the distance of a galaxy, the faster it is moving away. What is the significance of this relationship?

• It indicates that in the past, galaxies were much closer together than they are today.

• It demonstrates that the universe is expanding

• It indicates the universe may have begun with a large explosion.

• All of the above.

Tags

NGSS.HS-ESS1-2