Foundations of Astronomy (MindTap ...

14th Edition
Michael A. Seeds + 1 other
Publisher: Cengage Learning
ISBN: 9781337399920



Foundations of Astronomy (MindTap ...

14th Edition
Michael A. Seeds + 1 other
Publisher: Cengage Learning
ISBN: 9781337399920
Chapter 4, Problem 19RQ
Textbook Problem

When Mercury is at aphelion (farthest from the Sun) in Figure 4-13a, compare a, the semi major axis, to r, the distance from the Sun to Mercury. Is a greater than r, or less than r, or equal to r?

To determine

Whether the semi major axis of mercury is greater, less or equal to distance from Sun to Mercury when Mercury is at aphelion.

Explanation of Solution

According to Kepler’s first law, all planets moves around Sun in elliptical orbitals keeping Sun at one of its foci. The region where the planet is closer to Sun is called Perihelion, and the region where the planet is far away from Sun is called aphelion.

The distance from planet to Sun is greater at aphelion and lesser at perihelion. Since the orbit of Mercury is mostly elliptical than any other planets, the semi major axis is the half of the longest diameter...

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Chapter 4 Solutions

Foundations of Astronomy (MindTap Course List)
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Ch. 4 - In Ptolemys model, which of the followingepicycle,...Ch. 4 - Why did Copernicus have to keep small epicycles in...Ch. 4 - Was the belief held by ancient astronomers that...Ch. 4 - When Tycho observed the new star of 1572, he could...Ch. 4 - Assume the night is clear and the Moons phase is...Ch. 4 - Does Tychos model of the Universe explain the...Ch. 4 - Name an empirical law. Why is it considered...Ch. 4 - How does Keplers first law of planetary motion...Ch. 4 - When Mercury is at aphelion (farthest from the...Ch. 4 - In Figure 4-13b, did the planet travel faster from...Ch. 4 - What is P for Earth? What is a for Earth? Do these...Ch. 4 - Based Figure 4-13c, do planets with larger a take...Ch. 4 - How did the Alfonsine Tables, the Prutenic Tables,...Ch. 4 - Explain how each of Galileos telescopic...Ch. 4 - How did discovery of the Galilean moons disprove...Ch. 4 - How Do We Know? What is a paradigm, and how it is...Ch. 4 - How Do We Know? Describe the differences between a...Ch. 4 - Draw and label a diagram of the western horizon...Ch. 4 - If you lived on Mars, which planets would exhibit...Ch. 4 - How long does it take for one retrograde cycle of...Ch. 4 - If a planet has an average distance from the Sun...Ch. 4 - If a space probe is sent into an orbit around the...Ch. 4 - Uranus orbits the Sun with a period of 84.0 years....Ch. 4 - An object takes 29.5 years to orbit the Sun. What...Ch. 4 - One planet is three times farther from the Sun...Ch. 4 - Galileos telescope showed him that Venus has a...Ch. 4 - Which is the phase of Venus when it is closest?...Ch. 4 - Galileos telescopes were not of high quality by...Ch. 4 - Arrange the following in order of increasing...Ch. 4 - Arrange the following in order of increasing...Ch. 4 - With an outstretched arm, hover your thumb about ...Ch. 4 - Study Figures 4-11 and 4-16 and describe the...Ch. 4 - What three astronomical objects are represented...Ch. 4 - Use the figure below to explain how the Ptolemaic...

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