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

Astronomy notes sheets are here                    Details of more video lessons on data stick are here

Units used to measure distance in astronomy

Measuring distances in astronomy using parallax

Geostationary and polar satellites

Hubbles Law used to measure distance

Using Hertzsprung Russell diagrams and cephid variable to measure distance in astronomy

Hubble's Law used to estimate the age of the Universe