Galaxies Fade
On the human time scale, the Milky Way galaxy is eternal. The starry Milky Way shined down on the first […]
The Local Group
These galaxies move through space as a single unit, bound together by their mutual gravitational pull. The number of galaxies
The Milky Way
In summer, in a clear place with dark night skies, an irregular glowing band arcs high overhead. The ancients likened
Galaxy Formation
Observations by Hubble Space Telescope and ground-based instruments show that the first galaxies took shape as little as one billion
Types of Galaxies
The most beautiful galaxies are called spirals. The Milky Way is a spiral, and so is the Andromeda galaxy (M31).
Galaxies: Cities of Stars
Astronomer Edwin Hubble was studying an object in the autumn constellation Andromeda known as the Andromeda Nebula. Viewed through a