The Universe

What are constellations?

• Streaks of light produced by meteoroids burning in Earth's atmosphere.

• Visible groups of stars in the nighttime sky.

• Visible planets of the solar system in the nighttime sky.

• Remnants of the explosion of a star.

Tags

NGSS.MS-ESS1-1

Why does an observer at a given location see one set of constellations in the winter and a different set of constellations in the summer?

• An observer sees different set of constellations in winter and summer because of the intrinsic motion of the stars.

• As Earth orbits the Sun, the night side of Earth faces different parts of the universe.

• As Earth rotates around its axis, different parts of the universe are seen in the sky.

• None of the above.

Tags

NGSS.MS-ESS1-1

Why do the stars appear to turn on an imaginary north−south axis about once every 24 hours?

• Because of Earth's revolution about the Sun.

• Because of Earth's rotation on its own axis.

• Because of the intrinsic motion of the stars.

• None of the above.

Tags

NGSS.HS-PS2-1

Is the light-year a measurement of time or distance?

• Light-year is a measurement of distance.

• Neither; light-year is a measurement of light intensity from stars.

• Light-year is a measurement of time.

Tags

NGSS.HS-PS4-3

Which is hotter−a red star or a blue star?

• A red star and a blue star have the same surface temperature.

• A blue star is hotter than a red star.

• A red star is hotter than a blue star.

What is the difference between apparent brightness and luminosity?

• Apparent brightness is the brightness of a star as it appears to our eyes. Luminosity is the total amount of light energy that a star emits into space.

• Apparent brightness is the total amount of light energy that a star emits into space. Luminosity is the brightness of a star as it appears to our eyes.

• Apparent brightness is the brightness of a star as it appears to our eyes. Luminosity is the total amount of light energy that a star emits and reaches Earth's surface.

• Apparent brightness is the total amount of light energy that a star emits and reaches Earth's surface. Luminosity is the brightness of a star as it appears to our eyes.

What is an HR diagram?

• A plot of luminosity versus apparent brightness for stars.

• A plot of luminosity versus surface temperature for stars.

• A plot of apparent brightness versus surface temperature for stars.

• A plot of surface temperature of stars versus distance to Earth .

Tags

NGSS.HS-ESS1-3

Where are the great majority of stars plotted on an H−R diagram?

• In the main sequence.

• Among the giant stars.

• Among the white dwarfs.

• Among the supergiants.

Where does our Sun reside on an H−R diagram?

• In the main sequence.

• Among the supergiants.

• Among the giant stars.

• Among the white dwarfs.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Among stars from the main sequence, which are larger−red stars or yellow stars?

• Yellow stars

• Red stars and yellow stars are the same size.

• Red stars