A star has a parallax of .05", its distance is Group of answer choices5 light years.20 parsecs.200 parsecs.660 light years.

Find the distance in parsecs to Bernard's Star, which has an annual parallax of 0.549 arcsec.

Proxima Centauri is the closest star to Earth after the sun and it is 4×1013  km4×10 13   km away! We can calculate how long it takes light to travel from this star to earth by dividing its distance from earth by the speed that light travels, which is 1×109  km/hr1×10 9   km/hr.  Evaluate the expression below using index notation to determine how long it takes light from Proxima Centauri to reach Earth in hours. 4×10131×1091×10 9 4×10 13 ​  Remember to include units with your answer.

State why there is a maximum distance that astronomers can measure usingstellar parallax.

How far away (in ly) is the star closest to the Sun? lyWhat is its name?PolarisProxima Centauri    SiriusTau Ceti

Which of the following distances represents an astronomical unit? athe distance between Earth and the moon bthe distance between the sun and Earth cthe distance across the entire solar system dthe distance across the Milky Way galaxy