Answered: (II) A light-year is the distance light…

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter19: Celestial Distances

Section: Chapter Questions

Problem 7E: While a meter is the fundamental unit of length, most distances traveled by humans are measured in...

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Recent findings in astrophysics suggest that the observable universe can be modeled as a sphere of radius R=13.7x10⁹light-years=13.0 x 10²⁵m with an average total mass density of about 1x10^-26kg/m³ Only about 4% of total mass is due to “ordinary” matter (such as protons, neutrons, and electrons). Estimate how much ordinary matter (in kg) there is in the observable universe. (For the light-year, see Problem 19.)

(II) A light-year is the distance light travels in one year (at
speed = 2.998 x 10*m/s). (a) How many meters are
there in 1.00 light-year? (b) An astronomical unit (AU) is
the average distance from the Sun to Earth, 1.50 × 10 km.
How many AU are there in 1.00 light-year?

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