Astronomy video – measuring distances
The astronomy video lessons below concentrate on the various methods of estimating/measuring distance.
The measurement, or more accurately, the estimation of distance is one of the hardest problems facing astronomers due to the huge distances involved. Measurements within the solar system are can be accurate but those to distant stars and particularly to distant galaxies rely on indirect measurements assuming theories about the expansion of the universe and the action of particular types of stars. Confidence in the accuracy of measuring is increasing as our theories are refined and instruments improve but there is plenty of room for improvement