Chapter 17 Test Review: Question Preview (ID: 23959)

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A light-year is
a) 365 Days
b) the distance that light travels in a year
c) The distance from the Earth to the sun
d) The amount of light the sun produces in a year

A star is born when
a) a nebula expands
b) helium and oxygen combine
c) nuclear fussion starts
d) a protostar begins to form

A supernova is the explosion of a dying
a) mediun-mass star
b) high-mass star
c) protostar
d) low-mass star

The lifetime of a star depends on its
a) Tempature
b) absolute brightness
c) mass
d) Color and brightness

The milky way galaxy is an example of
a) spiral galaxy
b) globular galaxy
c) elliptical galaxy
d) irregular galaxy

The solar system formed from
a) An expanding galaxy
b) A cloud of gas and dust
c) An enormous explosion
d) a black hole

Absolute brightness of a star depends on
a) distance and tempreature
b) size and temperature
c) color and temperature
d) distance and color

The force that tends to pull together the matter in stars is
a) Gravity
b) nuclear fussion
c) dark energy
d) dark matter

Why are many large optical telescopes located in mountains?
a) to be closer to the stars
b) to be above part of the atmosphere
c) becasue it is easier to build telescopes on mountains
d) to be closer to city lights

What is likely to happen to the universe in the future?
a) It will contract
b) It will remain the same size
c) It will expand forever
d) It will expand and then contract

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