Physical Properties Of Stars Question Preview (ID: 43759)


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Many of the stars we see in the night sky are called blue giants. They put out more energy and burn millions of times brighter than the Sun. Why does the Sun appear much larger and brighter from Earth than blue giant stars?
a) It is larger.
b) It is closer.
c) It is a different color.
d) It is a different temperature.

Scientists classify stars by colors: white, red, blue. The color of a star helps to tells us how ________ the star is.
a) hot
b) far
c) big
d) old

Luminosity is the amount of energy emitted by a star each second. Stars radiate light over a broad range of frequencies in the electromagnetic spectrum, from the low energy radio waves to high energy gamma rays. The luminosity of a star depends on tw
a) age and surface area.
b) gravity and distance from Earth.
c) surface area and temperature.
d) distance from Earth and temperature.

Star light, star bright: how bright a star appears to us on Earth depends MAINLY on
a) the age of the star.
b) the star's distance from Earth.
c) the star's distance from the Sun.
d) the composition of the star.

Which of these stars is the OLDEST?
a) nearly 100% hydrogen
b) nearly 0% hydrogen
c) nearly 0% iron
d) nearly 50% hydrogen

The process that fuels a star is BEST described as
a) helium molecules being burned by fire.
b) fusion of helium molecules to form hydrogen
c) fission of helium molecules to form hydrogen.
d) hydrogen molecules being forced together by gravity.

Which process is occurring at the center of all active stars?
a) fission
b) flatulation
c) fusion
d) hydrogen decay

Many stars are classified in terms of brightness, or
a) age.
b) magnitude.
c) mass.
d) power.

A ___ star has a greater temperature than a ___ star.
a) blue, red
b) red, blue
c) red, yellow
d) yellow, blue

Our sun is
a) a very small star.
b) a very large star.
c) a medium-sized star.
d) not actually a star at all.

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