Last updated February 8, 2018 at 10:40 am
On the other side of the Milky Way, there are galaxies we cannot see with optical telescopes, as the visible light simply doesn’t reach Earth through the Milky Way. These, we call hidden galaxies – not visible to our eyes.
But with radio telescopes we can detect the radio waves emitted from these hidden galaxies. In this hidden zone, shielded by the bulk of the Milky Way, we can determine that there are more than 800 galaxies.