UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 23, Problem 8CC
To determine
The rungs on the distance ladder that rely on correct measurment of parallax.
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Why would it be easier to take parallax measurements if we were on a planet farther from the sun than Earth?
Distances to the nearest stars (up to 500 ly away) can be measured by a technique called parallax, as shown . What are the angles θ1 and θ2 relative to the plane of the Earth’s orbit for a star 4.0 ly directly above the Sun?
The 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 ?
Chapter 23 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
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- Parallaxes are measured in fractions of an arcsecond. One arcsecond equals 1/60 arcmin; an arcminute is, in turn, 1/60th of a degree (°). To get some idea of how big 1° is, go outside at night and find the Big Dipper. The two pointer stars at the ends of the bowl are 5.5° apart. The two stars across the top of the bowl are 10° apart. (Ten degrees is also about the width of your fist when held at arm’s length and projected against the sky.) Mizar, the second star from the end of the Big Dipper’s handle, appears double. The fainter star, Alcor, is about 12 arcmin from Mizar. For comparison, the diameter of the full moon is about 30 arcmin. The belt of Orion is about 3° long. Keeping all this in mind, why did it take until 1838 to make parallax measurements for even the nearest stars?arrow_forwardWhat would the parallax of Luhman 16 (see Exercise 19.38) be as measured from Earth?arrow_forwardWhat is the disadvantage of the parallax method, especially for studying distant parts of the Galaxy?arrow_forward
- Find the distance in parsecs to Vega, which has an annual parallax of 0.129 arcsec.arrow_forwardWhat is the distance in parsecs to Vega, which has an annual parallax of 0.129 arcsec.arrow_forwardA star is observed to have a parallax of 0.05". If we were to send a radio signal towards this star how much time would it take for the signal to reach the star?arrow_forward
- The star Spica is observed to have a parallax of 0.012000. How far away is it in parsecs answers to three significant figures.arrow_forwardThe center of our Galaxy is about 7500 parsecs from Earth. What would be the parallax angle of a star near the center of the Galaxy? Could this angle be measured with current technology?arrow_forwardWhen you say "sub-word parallax," what do you mean?arrow_forward
- The satellite Hipparcos was launched in 1989 to measure very accurate parallax angles of stars; it has provided the most accurate parallax measurements ever obtained. The smallest parallax angle it can measure is 0.002". How far away is the most distant star to which Hipparcos can measure the distance?arrow_forwardHow far away is the star Spica, whose parallax is 0.013"?arrow_forwardParallax Effect: If an observer measures the change in the position of a nearby star relative to the background of farther stars over six months, while the Earth moves in its orbit, the observer can then calculate what? Group of answer choices The distance of the nearby star The distance from the Earth to the Sun The size of Earth compared to the size of the Earth's orbit The time to the end of the world The size of the nearby star.arrow_forward
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