Physics of Everyday Phenomena
9th Edition
ISBN: 9781260048469
Author: Griffith
Publisher: MCG
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Chapter 21, Problem 12CQ
To determine
Whether the bright stars in the sky is always closer than the fainter stars in the sky.
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20.
A star is an example of a true blackbody.
True
False
Q15. The space observatory Gaia was launched in 2013 as the successor to
Hipparcos and is returning data on its ambitious mission to catalog the 3-
dimensional position of more than 1 billion stars in the Milky Way. The
smallest parallax angle it can measure, for stars of at least magnitude 12, is
0.000008", What is the most distant star to which Gaia can measure parallax?
Q16. The center of our Galaxy is about 8,500 parsecs from Earth.
a. What would be the parallax angle of a star near the center of the
Galaxy?
b. Could this angle be measured by Hipparcos?
c. Could this angle be measured by Gaia?
Our Sun is considered an "average" star. What is the average star really like? Explain. Could you go out at night and point out an average star? Why or why not?
Chapter 21 Solutions
Physics of Everyday Phenomena
Ch. 21 - Prob. 1CQCh. 21 - Prob. 2CQCh. 21 - Prob. 3CQCh. 21 - Prob. 4CQCh. 21 - Prob. 5CQCh. 21 - Prob. 6CQCh. 21 - Prob. 7CQCh. 21 - How do we know that the universe is expanding?...Ch. 21 - Prob. 9CQCh. 21 - Prob. 10CQ
Ch. 21 - Prob. 11CQCh. 21 - Prob. 12CQCh. 21 - Describe two astronomical discoveries that provide...Ch. 21 - Prob. 14CQCh. 21 - Prob. 15CQCh. 21 - Prob. 16CQCh. 21 - Prob. 17CQCh. 21 - Prob. 18CQCh. 21 - Prob. 19CQCh. 21 - Prob. 20CQCh. 21 - Prob. 21CQCh. 21 - Prob. 22CQCh. 21 - Prob. 23CQCh. 21 - Prob. 24CQCh. 21 - Prob. 25CQCh. 21 - Prob. 26CQCh. 21 - Prob. 27CQCh. 21 - Prob. 28CQCh. 21 - The average distance from the sun to Venus is...Ch. 21 - Prob. 2ECh. 21 - The nearest star to our sun is a red dwarf named...
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- The nearest neutron star (a collated star made primarily of neutrons) is about 3.00 1018 m away from Earth. Given that the Milky Way galaxy (Fig. P1.81) is roughly a disk of diameter 1021 m and thickness 1019 m, estimate the number of neutron stars in the Milky Way to the nearest order of magnitude. Figure P1.81arrow_forwardOne method to measure the diameter of a star is to use an object like the Moon or a planet to block out its light and to measure the time it takes to cover up the object. Why is this method used more often with the Moon rather than the planets, even though there are more planets?arrow_forwardThe nearest neutron star (a collated star made primarily of neutrons) is about 3.00 1018 m away from Earth. Given that the Milky Way galaxy (Fig. P1.81) is roughly a disk of diameter 1021 m and thickness 1019 m, estimate the number of neutron stars in the Milky Way to the nearest order of magnitude. Figure P1.81arrow_forward
- What is the main reason that the spectra of all stars are not identical? Explain.arrow_forwardA stellar black hole may form when a massive star dies. The mass of the star collapses down to a single point. Imagine an astronaut orbiting a black hole having eight times the mass of the Sun. Assume the orbit is circular. a. Find the speed of the astronaut if his orbital radius is r = 1 AU. b. Find his speed if his orbital radius is r = 11.8 km. c. CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronauts orbital speed be if his orbital radius were smaller than 11.8 km?arrow_forwardThe spectrum of the Sun has hundreds of strong lines of nonionized iron but only a few, very weak lines of helium. A star of spectral type B has very strong lines of helium but very weak iron lines. Do these differences mean that the Sun contains more iron and less helium than the B star? Explain.arrow_forward
- A star is observed to move away from us at a speed of 2.8km/s. How far is the star ? Express your answer in light years. I first tried 2.8 km/s divided by the Hobble constant of 21.4 km/s/MLY and got 0.13, but it's wrong. I then tried converting to light years and got 1.31E5, but it's still wrong.arrow_forward3:00 PM Fri 23 Apr * * ni 26% web.whatsapp.com + blob:https://web.whatsapp.com/d4009cff-8... G Identify the names of the four major arms of... W Inflation (cosmology) - Wikipedia in this water body. 4 of 9 Q.5 Identify the names of the four major arms of Milky way galaxy : a) Norma and Cygnus, Sagittarius, Scutum-crux, Perseus. b) Norma and Cygnus, Orion, Scrotum-crock, Perseus. c) Norma and Clittorus, Sagittarius, Scrotum-crux, Perseus. d) Norma and Cygnus, Orion , Scutum-crux, Perseus. Q.6 In a far far away Galaxy lies a solar system untold, wherein, lies the planet, Stephenland inhabited by Meeseeks (a simple, but sentient species ). Their planet is invaded by the dreaded Brainiac Titanoids and their minions, P'nados . They started exploiting the natural resources of the planet at a scale, wherein, it actually started having affecting the mass of the planet. The mass lost was so huge that the atmosphere of the planet was actually endangered. They're now facing the threat of a waning…arrow_forwardThe Messier Catalog is a. a listing of all the stars within the Local Bubble b. a list of all the HII listings visible without a telescope c. a list of nebulae, star clusters, and galaxies that might be mistaken for a comet far from the sun d. a list of regions where dark clouds large numbers of molecules can be foundarrow_forward
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