1.)How long do you have to wait for a star to undergo its maximum parallactic displacement? 2.) How can the observation of stellar parallaxes in general be used as evidence against a geocentric view of the cosmos?
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1. A star to undergo its maximum parallactic displacement is about 326 light years that is equal to 100 parsecs.
Maximum parallactic displacement is the distance between the apparent position of object along two different sights lines that are measured using inclination angles between those two lines.
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- 4. The observed brightness of a luminous object falls off as the square of its distance from us (the inverse square law). Two stars of identical luminosity are observed: the apparent brightness of the further one is 10 000 times less than the nearer. (a) What is the difference in apparent magnitude? (b) How many times further away is it?42. A galaxy cluster has a galaxy behind it whose image we see as being smeared out and curved, with an angular radius of curvature on the sky of θE. The background galaxy is at redshift zgal and the cluster is at zclust. What is the mass of the cluster in solar masses? Give your response in scientific notation with one decimal place. (The Hubble constant is of course 70 km/s/Mpc, and you can assume the Hubble law for these low redshifts). Values: zgal = 0.11 zclust = 0.07 θE = 117.4 arcseconds
- Please help me with this.3 From Wikipedia: "Various sources state the first Death Star has a diameter of approximately 140 kilometers." A) In order to stand on the surface of the Death Star and experience the familiar gravitational acceleration of g = 9.8 m/s², what is the required mass of the Death Star? Calculate the density as well (yikes!) B) An escape pod is now launched from the surface of the Death Star at speed v₁ = 760 m/s. How fast is the pod moving when it reaches a distance of 130 km from the center of the Death Star? Star31) Star Sirius has an apparent magnitude of -1.47 and an absolute magnitude of 1.41. Estimate the distance to Sirius.
- Question 16 Solve for m₁ in the following equation FT - m₁gsin(theta) = m₁a O. FT/(g(sin(theta)+a) O FT/(gsin(theta)) O FT/lagsin(theta)) O FT/(asin(theta)) Previous No new data to save. Last c12 Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond. The distance to this star is A) 2 parsecs. B C 0.5 parsec. E 5 light-years. (D) 5 parsecs. 0.5 light-year.6) Estimate the distance to the star with absolute magnitude -5.6 and apparent magnitude 0.75