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Chapter 1 HW
Terms in this set (18)
A galaxy contains
large amounts of gas, dust, and stars.
How many centimeters are there in one kilometer?
Scientific notation is used in science because
it makes it easy to write large or small numbers.
The average distance from Earth to the sun is
64,200,000,000 is equal to
6.42 X 10 ^10
3.0 X 10 ^ 5 times 1.5 X 10^9 is equal to
4.5 X 10 ^14
4.4 X 10 ^6 divided by 8.8 X 10 ^10 is equal to
5.0 X 10 ^-5
If light takes 8 minutes to reach Earth from the sun and 5.3 hours to reach Pluto, what is the approximate distance from the sun to Pluto?
If the light takes 8 minutes to reach Earth from the sun and the nearest star is 4.7 light years from the sun, what is the distance from the sun to the nearest star in astronomical units?
If the nearest star is 4.2 light-years away, then
the light we see left the star 4.2 years ago.
The Milky Way Galaxy
is located about 2.2 million light years from the sun.
Which of the following is the largest?
the distance from Earth to the sun
Which arrangement is in order of increasing size, left to right?
planet, star, solar system, galaxy
The Milky Way Galaxy (2)
contains about 100 billion stars.
If the Milky Way Galaxy contains 100 billion stars and only one star in 100 has an Earth like planet, how many stars in the Milky Way Galaxy have Earth-like planets?
1,000,000,000 = one billion
Suppose we wish to travel to the nearest star using a super space ship capable of traveling at 1X10^10 km/yr. We have nothing even close to this space ship yet. How long will it take us to get to the nearest star which is about 4X10^13 km away from us?
What does the size of the image of a star in a photograph tell us about the star?
the brightness of the star
Earth has a radius of about 6400 km, the sun has a radius of about 7.0X10^5 km. Assume Earth to be a typical planet and the sun to be a typical star. If you were to attempt to use a telescope to observe an Earth type planet circling the nearest star, one AU from that star, which would be easier to see with the telescope, the star or the planet?
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