Answered: An astronomical unit (AU) is defined as…

An 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 Sun

Foundations of Astronomy (MindTap Course List)

14th Edition

ISBN:9781337399920

Author:Michael A. Seeds, Dana Backman

Publisher:Michael A. Seeds, Dana Backman

Chapter1: Here And Now

Section: Chapter Questions

Problem 1SOP: Arrange the following in order of increasing size: Earth; the Sun; Earths orbit around the Sun; the...

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Concept explainers

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

An 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 Sun

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Arrange the following in order of increasing size: Earth; the Sun; Earths orbit around the Sun; the Moon; you; the Milky Way Galaxy; the Moons orbit around Earth
What is the difference between the Solar System, the Galaxy, and the Universe?
The distance from the Sun to the nearest star is about 4 1016 m. The Milky Way galaxy (Fig. P1.31) is roughly a disk of diameter 1021 in and thickness 1019 m. Find the order of magnitude of the number of stars in the Milky Way. Assume the distance between the Sun and our nearest neighbor is typical. Figure P1.31 The Milky Way galaxy.
In astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. The distance to Alpha Centauri, the closest star other than our own sun that can be seen by the naked eye, is 4.3 light-years. Express this distance in meters.
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. About 1011 About 1016 About 1021.
The brightest star in the northern hemisphere is Sirius. Its distance from earth is estimated to be 8.7 light years. A light year is the distance light travels in one year. Light travels at a speed of 3.00 x 108 m/s. Calculate the distance from earth to Sirius in miles. (1 mi = 5280 ft)
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A light year is the distance traveled by light in one year. Identify the distance to a nearby galaxy that is 2X106 light years away. (The speed of light is 3X108m/s) A. 10´1015m B. 6´1012m C. 2´1022m D. 1´1018m
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.
In astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. If the distance to a star is 3.5 light-years, what is this distance in meters? (There are 365.25 days in one year.)
(a) Astronomers use a special unit to measure distances called astronomical unit (AU) where 1 AU is defined as 92,955,807 miles. They also use another unit called parsecs where 1 parsec is equal to 206,264.4 AU. Convert 1 Zm (zettametre) into kiloparsecs. (Given 1 mi = 1.609 km; 1 km = 1000 m).
A parsec is an astronomical unit of distance where 1 parsec = 3.26 light years (1 light year equals the distance traveled by light in one year). If the speed of light is 186,000 mi/s, calculate the distance in meters of an object that travels 7.5 parsecs. m