Which of the following is a general difference between a planet and a star? - correct-answers -
Stars shine with energy released by nuclear fusion while planets shine primarily with light
reflected from stars.
Our solar system consists of _________. - correct-answers -the Sun and all the objects that orbit
it.
A typical galaxy is a _________. - correct-answers -collection of millions or billions of stars,
bound together by gravity and orbiting a common center
Which of the following best describes what we mean by the term universe? - correct-answers -a
sum total of all matter and energy
An astronomical unit (AU) is _________. - correct-answers -the average distance between the
earth and the sun
A light-year is _________. - correct-answers -about 10 trillion kilometers
A television advertisement claiming that a product is light-years ahead of its time does not make
sense because _________. - correct-answers -it uses "light-years" to talk about time, but a light-
year is a unit of distance
The term observable universe refers to _________. - correct-answers -that portion of the
universe that we can see in principle, given the current age of the universe
On a scale where the distance from Earth to the Sun is about 15 meters, the distance from Earth
to the Moon is _________. - correct-answers -small enough to fit within your hand
Stars shine with energy released by nuclear fusion while planets shine primarily with light
reflected from stars.
Our solar system consists of _________. - correct-answers -the Sun and all the objects that orbit
it.
A typical galaxy is a _________. - correct-answers -collection of millions or billions of stars,
bound together by gravity and orbiting a common center
Which of the following best describes what we mean by the term universe? - correct-answers -a
sum total of all matter and energy
An astronomical unit (AU) is _________. - correct-answers -the average distance between the
earth and the sun
A light-year is _________. - correct-answers -about 10 trillion kilometers
A television advertisement claiming that a product is light-years ahead of its time does not make
sense because _________. - correct-answers -it uses "light-years" to talk about time, but a light-
year is a unit of distance
The term observable universe refers to _________. - correct-answers -that portion of the
universe that we can see in principle, given the current age of the universe
On a scale where the distance from Earth to the Sun is about 15 meters, the distance from Earth
to the Moon is _________. - correct-answers -small enough to fit within your hand
