What are galaxies?

Our Understanding of Galaxies: A Timeline Galaxies are cosmic islands of stars, planets, nebulas, gas, dust, and dark matter that are separated from one another in space but collectively help to tell the story of the universe.

Should’galaxies for geeks’have a working title?

— Prof. Stephen E. Zepf, Michigan State University ‘The authors should have retained their working title: “Galaxies for Geeks”‘ — Jennifer L. Hoffman, now Professor of Physics and Astronomy at Denver University ‘Not thick enough to be really useful…’

What was the first Galaxy in the universe like?

The galaxy is likely representative of young galaxies from its time, thus giving us a glimpse of what some of the universe’s first galaxies were like. A tiny red streak (magnified in the inset) in this Hubbleimage is a galaxy seen at a time when the universe was just 500 million years old.

What is the faintest galaxy in the universe?

Taking advantage of a natural zoom lens in space, Hubblespotted the faintest galaxy yet found in the very early universe. Existing about 400 million years after the Big Bang, the dim, remote galaxy was made to look 20 times brighter than normal by the gravitational lensing of a massive cluster of galaxies called MACS J0416.1-2403.