Astronomy Today (9th Edition)
9th Edition
ISBN: 9780134450278
Author: Eric Chaisson, Steve McMillan
Publisher: PEARSON
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Chapter 1, Problem 2D
To determine
The comparison of the size of the Earth with that of the Sun, the Milky Way Galaxy, and the entire universe.
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Astronomers frequently say that “there are more stars in the universe than there are grains of sand on all the beaches on the earth”. Given that a typical grain of sand is about 0.5 – 1.0 mm in diameter, estimate the number of grains of sand on all the earth’s beaches. The diameter of the Earth is 12,742 km.
Compare the values of the number of grains of sand in all earth’s beaches with the number of stars in the universe – which is greater?
Number of sand grains
Number of stars
They are about the same.
Which of the following lists in order from smallest to largest?
O universe --> solar system --> galaxy
O galaxy --> solar system --> universe
O solar system --> universe --> galaxy
solar system --> galaxy --> universe
Chapter 1 Solutions
Astronomy Today (9th Edition)
Ch. 1 - Prob. 1DCh. 1 - Prob. 2DCh. 1 - Prob. 3DCh. 1 - Prob. 4DCh. 1 - Prob. 5DCh. 1 - Prob. 6DCh. 1 - Prob. 7DCh. 1 - Prob. 8DCh. 1 - Prob. 9DCh. 1 - Prob. 10D
Ch. 1 - Prob. 11DCh. 1 - Prob. 12DCh. 1 - Prob. 13DCh. 1 - Prob. 14DCh. 1 - Prob. 15DCh. 1 - Prob. 1MCCh. 1 - Prob. 2MCCh. 1 - Prob. 3MCCh. 1 - Prob. 4MCCh. 1 - Prob. 5MCCh. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - Prob. 8MCCh. 1 - Prob. 9MCCh. 1 - Prob. 10MCCh. 1 - Prob. 1PCh. 1 - Prob. 2PCh. 1 - Prob. 3PCh. 1 - Prob. 4PCh. 1 - Prob. 5PCh. 1 - Prob. 6PCh. 1 - Prob. 7PCh. 1 - Prob. 9P
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- What is the difference between the Solar System, the Galaxy, and the Universe?arrow_forward1 million kilometers can be expressed in scientific notation as: 10x10^6 km 10x10^-6 km none of these 1x10^6 km 1x10^-6kmarrow_forwardAn astronomical unit (AU) is defined as the average distance between the solar system and Alpha Centauri the Earth and the Moon the Milky Way Galaxy and the Andromeda Galaxy the Earth and the Sunarrow_forward
- What will be the long-term future of our Galaxy?arrow_forwardA typical galaxy is shown on the first page of the Universe Bowl on the inside cover of the printed book. Express the number of stars in this typical galaxy in scientific notation.arrow_forwardRank these objects from oldest to youngest the Solar System, the Universe, the Milky Way Galaxy.arrow_forward
- What is the densest substance in the universe?arrow_forwardHow big is the universearrow_forwardgiven: a (distance to center of galaxy in AU) = 1,717,914,439 AU P (suns orbital period in years) = 203,782,828.3 years M (mass of milky way galaxy in solar masses) = 1.22 x 10^11 Msun Question: Assume the Milky Way Galaxy is made up entirely of stars like the Sun, i.e. on average each star has the mass of 1 MSun. Under this assumption, approximately how many stars are there in our galaxy? Express this answer in billions of stars (1 billion = 109).arrow_forward
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