Brightness of Stars Review

The Sun is the brightest star in our sky because _______________.

• it is the largest

• it is the closest star to us

• it is the hottest star

• it gives off the greatest amount of light

A star's apparent brightness refers to _____________.

• how bright it appears to shine

• how intense the amount of light is

• how much light is given off

• how much light is given off by the Sun

Tags

NGSS.HS-PS4-3

What affects a star's apparent brightness the most?

• its luminosity

• its size

• its distance from the Earth

• its composition

The image below shows a star's luminosity as viewed from Earth. Decide if the star's luminosity is least luminous, more luminous, or most luminous.

• least luminous

• more luminous

• most luminous

What is the term for the brightness of a star as seen from Earth?

• Absolute magnitude

• Luminosity

• Apparent magnitude

• Radiance

A star's brightness is directly dependent on the star's what?

• The size of the star- the smallest stars are the brightest

• The size of the star- the biggest stars are the brightest

• The age of the star - the middle aged stars are ALWAYS the brightest

• The age of the star- the youngest stars are the LEAST bright

Why does the sun appear brighter than the supergiant star Betelgeuse?

• the sun is a different color

• the sun is older

• the sun is closer

• the sun is made of different elements

A student learns that the sun is classified as a medium-size star and that many stars are much bigger and brighter. However, the student observes that other stars look very dim, even through a telescope. Why do other stars look much dimmer than the sun?

• The sun appears yellow, which is more visible than other colors.

• The sun is much closer to Earth than other stars are.

• Other stars are made up of different gases that the sun is.

• As light from other stars travels through space, it gets reflected.

Brightness of a star as seen from Earth

• parallax

• apparent magnitude

• absolute magnitude

• spectrum

With the use of the Hubble Space Telescope, scientist recently discovered a giant runaway star.  It is 90 times larger than the sun and is very hot and blue-white in color.  Why does the sun to be brighter than this runaway star when viewed from Earth?

• The sun is a different color than the runaway star.

• The sun is older than the runaway star. 

• The sun is closer to Earth than the runaway star. 

• The sun is made of different elements than the runaway star.