Astronomy Today (9th Edition)
9th Edition
ISBN: 9780134450278
Author: Eric Chaisson, Steve McMillan
Publisher: PEARSON
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Question
Chapter 1, Problem 10MC
To determine
The correct option, from the following options, for the method used to measure distances to stars now a days.
(a) Bouncing radar signals.
(b) Reflected laser beams.
(c) Travel time by spacecraft.
(d) Geometry.
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Students have asked these similar questions
By the term universe, astronomers mean:
The system of 200 to 400 billion stars, of which the sun is one.
The collection of several dozen galaxies, of which the Milky Way is one.
Everything that we can observe.
The realm inside the atom.
Light from the Sun reaches us in nearly
A. 2 minutes
B. 4 minutes
C. 8 minutes
D. 16 minutes
What is our "cosmic address"?
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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- The meter was redefined as a reference to Earth, then to krypton, and finally to the speed of light. Why do you think the reference point for a meter continued to change?arrow_forwardWhat is the speed of light? Is it constant all over the universe?arrow_forwardWhat is the distance in meters to our Sun that is 500 light-seconds away?arrow_forward
- Choose the BEST answer to the following: If a star that is 20 light-years from Earth explodes, gravitational waves from the explosion would reach Earth in (a) less than 20 years. (b) 20 years. (c) more than 20 years. (d) None of these.arrow_forwardConsider three cosmological perspectives-the geocentric perspective, the heliocentric perspective, and the modern perspective-in which the Sun is a minor star on the outskirts of one galaxy among billions. Discuss some of the cultural and philosophical implications of each point of view.arrow_forwardHuman civilization is about 10,000 years old as measured by the development of agriculture. If your telescope collects starlight tonight that has been traveling for 10,000 years, is that star inside or outside our Milky Way Galaxy? Is it likely that the star has changed much during that time?arrow_forward
- Your astronaut twin brother is exploring a planet of a star far out in space. Ignoring the time spent exploring the planet (during that time your watches run equally fast) also ignoring the time spent getting up to cruising speed, and slowing down for landing, (after all those times are very short compared to the time cruising,) how fast will that space ship have to cruise in order for your brother to age 2 years for every year you age?arrow_forwardThe Hubble Space Telescope orbits the Earth every 95 minutes, taking breathtaking images of our universe. Calculate its altitude above the Earth's Surface.arrow_forwardThe closest star to Earth, after the Sun, is Proxima Centauri, which is just over 4 light years away from us. A light year is the distance traveled in one year by light, which travels at about 300,000 kilometers per second. What is the order of magnitude of the number of kilometers that separate us from Proxima Centauriarrow_forward
- What is milky way ? Write just 1 paragraph.arrow_forwardWhen was universe was createdarrow_forwardChoose a unit distance in cm that would easily fit on a piece of paper. Let this be your scale distance, now divide your scale distance by 4.3 light years to get the scale that will allow you to convert between real distances and distances in your model. Scale = cm / 4.3 ly = cm / lyarrow_forward
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