Space Warps Talk

Ganymede 1969

  • Ganymede1969 by Ganymede1969

    A newcomer wondering why it is that the very distant objects imaged by these 'space warps', that are in fact gigantic telescopes of galactic size, are blue when one would expect ultra distant objects to be very red shifted.

    Posted

  • Tom_Collett by Tom_Collett scientist

    Very good question! Redshifting does make distant things tend to look redder, but most of the sources we are looking for are intrinsically very blue; this is because they have lots of massive, young, hot stars in them.

    Posted

  • Budgieye by Budgieye moderator

    The blue colour of the distant galaxies is redshifted to green when it reaches us, but is presented as blue on the computer screen.enter image description here
    enter link description here

    green filter is presented as blue

    red filter is presenter as green

    far red filter is presented as red

    So we can overlook the effect of redshift. When the infrared space telescope James Watt sends images, the image will be reconstructed the same way.

    Posted