Triangulum Galaxy: The Milky Way’s Smaller Neighbor

The Triangulum Galaxy (M33) is the third-largest member of our Local Group, after the Milky Way and Andromeda.
It sits about 3 million light-years away in the constellation Triangulum.
M33 spans roughly 60,000 light-years—smaller than the Milky Way but still vast.
It contains around 40 billion stars, making it a mid-sized spiral galaxy.
The Triangulum Galaxy is thought to orbit near Andromeda, possibly as a satellite.
Its spiral arms are rich with glowing nebulae and active star-forming regions.
The giant H II region NGC 604 in M33 is one of the largest stellar nurseries known.
Unlike Andromeda and the Milky Way, M33 lacks a prominent central bulge.
It is a favorite target for amateur astronomers because it can be spotted with binoculars under dark skies.
Together, the Milky Way, Andromeda, and Triangulum form the Local Group’s “big three.”