Stars and the Universe Chapter 1
the average distance from earth to the sun is
1 AU
How many centimeters are there in one kilometer?
100,000
2.9 x 10^7 is the same as
29 million
if the light takes 8 minutes to reach earth from the sun and the nearest start is 4.7 ly from the sun, what is the distance from the sun to the nearest start in astronomical units?
310,000 AU
3.0x10^5 times 1.5x10^9 is equal to
4.5x10^14
if light takes 8 minutes to reach earth from the sun and 5.3 hours to reach pluto, what is the approx. distance from the sun to Pluto?
40 AU
4.4x10^6 divided by 8.8x10^10 is equal to
5.0x10^-5
64,200,000,000 is equal to
6.42 x10^10
the radius of the moon's orbit is about _____ times larger than the radius of earth.
60
Earth has a radius of about 6400 km, the sun has a radius of about 7.0 105 km, and a rubber ball has a radius of 6.4 cm. If you were to construct a scale model of the solar system using the rubber ball to represent the earth, what is the radius of a ball needed to represent the sun in your model?
700 cm
A supercluster refers to a larger group of stars within the Milky way
False
The local group contains the sun and only about two dozen other stars
False
a kilometer contains 1 million meters
False
From 1979 to 1999 Pluto was closer to the sun than
Neptune
The metric system is a decimal system
True
a light year is the distance light travels in one year
True
the average distance from earth to the sun is 1 AU
True
the sun is a start in the milky way galaxy
True
The sun is
a star, 1 AU from earth, more than 100 times the diameter of earth
The Milky Way Galaxy
contains about 100 billion stars
the nearest start is 1 ly from the solar system
false
The Milky Way Galaxy
is about 75,000 light-years in diameter
Scientific notation is used in science because
it makes it easy to write large or small numbers
A galaxy contains
large amounts of gas, dust, and stars
What does the size of the image of a start in a photograph tell us about the star?
the brightness of the star
Which of the following is the largest?
the distance from Earth to the Sun
if the nearest star is 4.2 light-years away, then
the light we see left the star 4.2 years ago