21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 5, Problem 36QP
To determine
The brightness of the Sun from Neptune and compare the brightness of the Sun seen by voyager 1 with that seen from he Earth.
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Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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- An astronomer on a planet orbiting the star Deneb wants to differentiate the reflected light by Earth from the light of the Sun. First, consider the area of Earth's disk which reflects the Sun's intercepted light. Second, consider the surface area of a sphere with the same radius as Earth’s orbit around the Sun. Take the ratio of these two areas. Assume the Earth's radius is 6200.0 km and is 1.5 × 108 km from the Sun.arrow_forwardhow long, in years, \ would it take voyager 1 traveling at 61,146 km/h to reach a star 9.1 light years awayarrow_forwardWhat diameter telescope is needed to resolve the separation between an Earth-like planet and its star at 550 nm if the linear separation between them is 1 AU and the star system is 1 pc from Earth?arrow_forward
- What would be the advantage of making parallax measurements from Pluto rather than from Earth? Would there be a disadvantage?arrow_forwardFrom Doppler shifts of the spectral lines in the light coming from the east and west edges of the Sun, astronomers find that the radial velocities of the two edges differ by about 4 km/s, meaning that the Sun’s rotation rate is 2 km/s. Find the approximate period of rotation of the Sun in days. The circumference of a sphere is given by 2pR, where R is the radius of the sphere.arrow_forwardHow does this radius of Sirius B compare with that of Earth?arrow_forward
- Imagine there is a large star that produces 2.5 x 1030 Watts of power. If there is a planet orbiting this star from 500 million kms away, what would be the solar constant of that planet? a. 7,900W/m2 b. 52,000 W/m2 c. 250,000 W/m2 d. 800,000 W/m2arrow_forwardEarth is about 150 million kilometers from the Sun (1 Astronomical Unit, or AU), and the apparent brightness of the Sun in our sky is about 1300 watts/m2. Using these two facts and the inverse square law for light, determine the apparent brightness that we would measure for the Sun if we were located at the following positions. a) At the orbit of Jupiter (780 million km from the Sun).arrow_forwardWhat fraction of the energy emitted from the sun is absorbed by the Earth? Treat the sun like a light bulb 93 million miles away. Also, assume the Earth only absorbs the energy associated with an area of approximately 50 million square miles. (This is roughly the area of a disc with the same radius as the Earth.)arrow_forward
- 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)arrow_forwardCool hydrogen emits a radio signal at the specific wavelength of 21 cm. What is the energy associated with this wavelength and how does it compare to the energy emitted by a photon of red light of wavelength 700 nm?arrow_forwardThe nearest star to our solar system is 4.29 light years away. How much is thisdistance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show when viewed from two locations of the Earth six months apart in its orbit around the Sun ?arrow_forward
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