These appear as star-like objects but actually have redshifts indicating very remote distances. These objects are small (size of the Solar system) but extremely bright.

They are powered by supermassive black holes which draw in stars and gas to produce their prodigious luminosity (and cause outflows in jets).

Some of the most distant and faintest galaxies yet seen were observed in the Hubble Deep Field project (based on 10 days of exposure with the Hubble Space Telescope). This image shows galaxies as they appeared in the first billion years after the Big Bang. Many galaxies appear irregular and may reflect infall of various clumps of material.

The youngest, most distant galaxies will best be observed in infrared colors because of their extreme redshift. This will be one of the main goals for the Next Generation Space Telescope.