Vocabulary
Stars
Luminosity
100
a celestial ball of burning gas
star
100
Stars are composed of ____________.
gases and plasma
100
What is luminosity?
Luminosity is the apparent brightness of a star from Earth.
200
the size of an object
magnitude
200
Compared to other stars in the sky, the Sun appears brighter because it is _________.
closer
200
What are two factors that contribute to the luminosity of a star?
size and distance
300
the apparent brightness of a celestial object as seen from Earth
luminosity
300
A very bright start can seem dimmer because it is _________________.
far away.
300
Explain how size effects luminosity.
The larger the star is, the brighter it looks from Earth.
400
the unit of astronomical distance that equals the distance that light travels in 1 year
lightyear
400
Which star in the table is closest to Earth?
Star 2
400
Explain how distance affects luminosity.
The closer the star is to Earth, the brighter or more luminous it appears.
500
the size of a celestial object as seen from Earth
apparent magnitude
500
Which star in the table is larger?
Star 1
500
Explain why the Sun appears so bright in our sky.
The Sun appears so bright in our sky because it is the closest star to Earth.