Open Stax Astronomy

What does a spectrum reveal about a star?

• The star's name and age

• The star's movement direction

• The physical data based on color and wavelength

• The star's exact distance from Earth

Who introduced a new system of stellar classification in 1901?

• Annie Jump Cannon

• Max Planck

• Cecelia Payne-Gaposchkin

• Meghnad Saha

What element is most abundant in stars, as shown by their spectra?

• Hydrogen

• Carbon

• Helium

• Oxygen

Tags

NGSS.HS-ESS1-2

Why are there no green stars?

• Green light is absorbed by Earth's atmosphere

• Our eyes mix colors, making green stars appear white

• Green stars are too faint to see

• Stars do not emit green light

Tags

NGSS.HS-PS4-1

Why does the Sun appear yellow to us?

• It emits primarily yellow light

• It's a psychological effect

• The Sun's surface is actually yellow

• Shorter wavelengths are scattered by Earth's atmosphere

Tags

NGSS.MS-PS4-2

How does the Sun's light appear to us on Earth?

• White

• Red

• Blue

• Yellow

Tags

NGSS.HS-PS4-3

What does the HR Diagram plot?

• A star's color versus its speed

• A star's luminosity versus its temperature

• A star's distance versus its brightness

• A star's size versus its age

What is the significance of the main sequence in the HR Diagram?

• It shows the birth of stars

• It illustrates where stars spend most of their lives

• It plots the path of comets

• It represents the end stage of stars

Tags

NGSS.HS-ESS1-1

What determines a star's rate of fusion?

• The presence of planets

• Its age

• The pressure in its core

• Its distance from Earth

Tags

NGSS.HS-ESS1-1

What type of stars are found on the upper right of the HR Diagram?

• White dwarfs

• Main sequence stars

• Blue supergiants

• Red giants