The Doppler effect (artist's impression)

Loading player...

The Doppler effect explains why objects moving towards us or away from us at high speed appear to have their colours shifted either towards blue or red respectively.

When an object moves towards us, the crests of the light waves we see from it are compressed together, making the wavelength of the light shorter (and hence bluer), while for an object moving away the separation between crests is stretched, making the light's wavelength longer (and hence redder). In this simulation, the white source of light, as it moves right, would appear blue to an observer on the right-hand side, and red to an observer on the left.

Credit:

ESA/Hubble (L. Calçada)

About the Video

Id:hubblecast43f
Release date:1 March 2011, 16:00
Duration:19s

About the Object

Type:• X - 3D Animations Videos
• X - Quasars/AGN/Black Hole Images/Videos
• X - HD Videos

HD

HD & Apple TV
13.2 MB
Full HD 1080p
20.9 MB

Large

Large QT
5.5 MB

Medium

Video Podcast
4.3 MB
Medium MPEG-1
10.3 MB
Medium Flash
4.9 MB

Small

Small Flash
2.2 MB
Small QT
1.2 MB

For Broadcasters

Broadcast SD
131.4 MB

Also see our