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Introduction to Astronomy April 2022

April 4 @ 8:00 pm - 9:00 pm

Measuring Distances In Space

Part 1: Principles & Methods

Descriptions of most astronomical objects such as planets, stars and galaxies usually include how far away from Earth they are. The quoted distance may involve millions of kilometres, light years or parsecs.

Tonight’s talk is Part 1 of 2, discussing the principles and methods used to measure distances across space. First, we cover what light years and parsecs refer to and when astronomers use them, followed by the principles of geometric trigonometry, standard candles, spectral redshifts, standard sirens and standard rulers. We will then review the numerous methods involving those fundamental principles.

In May, Part 2 will discuss how scientists use the cosmic distance ladder to calibrate these measurements and maximise precision. We will also discuss the Hubble tension and offer a solution.

Part 1 is solely online at our AAS YouTube Channel



April 4
8:00 pm - 9:00 pm


Dr Chris Benton