# Hubble's Law and The age of the Universe

- Created by: Simon
- Created on: 18-04-13 15:09

Hubble's Law

**Recognise and use the expression relating flux, luminosity and distance and understand its application to standard candles.**

Standard Candles are stars that have properties that mean their luminosity can be determined separately from other measurements. The standard candles can be used to calculate the distances to stars near them.

Where F is the radiant energy flux and d is the distance

**radiant flux** or **radiant power** is the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light). The power may be the total emitted from a source, or the total landing on a particular surface.

**Explain how distances can be determined using trigonometric parallax and by measurements of radiation flux received from objects of known luminosity.**

1 light year = distance light travels in a year which is roughly 10^16 metres.

1 AU = 1.5 x 10^15 m

Trigonometric parallax is a method for calculating the distances to relatively close stars.

The position of a foreground star is measured when…

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