The Star of Our Show

The Sun is the largest and brightest star seen from Earth because:

• it is the closest star to Earth.

• it is the hottest star in the universe.

• it is the largest star in the universe.

• it is the only star in our solar system.

What is the factor that affects how bright we see a star from Earth?

• Distance

• Temperature

• Size

• All of the above.

What term do scientists use to describe the apparent brightness of a celestial object as seen from Earth?

• A. luminosity

• B. magnitude

• C. apparent magnitude

• D. light-year

What term do scientists use to describe the unit of astronomical distance that light travels in 1 year?

• luminosity

• magnitude

• apparent magnitude

• light-year

Which of the following does NOT affect the luminosity of an object?

• A. size

• B. type of star

• C. distance

• D. your location on Earth

Stars are composed of —

• solid rock.

• gases

• various liquids.

• solids, liquids, and gases.

Compared to other stars in the sky, the Sun appears brighter because it is —

• A. closer.

• B. smaller.

• C. farther.

• D. larger.

A very bright star can seem dimmer because it is —

• close.

• blue in color.

• far away.

• larger than other stars.

What is luminosity?

• A measure of brightness

• A type of sound

• A form of energy

• A unit of time

Two factors that contribute to the luminosity of a star are:

• Temperature and size

• Distance and age

• Mass and distance

• Color and brightness