The Great Rift is a dark swath in the Milky Way

Astronomy

Posted by Bruce McClure, August 20, 2025 here.

Densely starry sky with detailed cloudy band of the Milky Way and 3 extra-bright stars well separated.
The 3 brightest stars in this image make up the asterism of the Summer Triangle, a giant triangle in the sky composed of the bright stars Vega (top left), Altair (lower middle) and Deneb (left center). Also in this image, under a dark sky and on a moonless night, is the Great Rift, that passes right through the Milky Way and the Summer Triangle. Image via NASA/ A. Fujii/ ESA.

The Great Rift is the name for a long swath of gaseous clouds, darkening a stretch of the starry band of the Milky Way in our sky.

The Milky Way is the edgewise view into our home galaxy. It has an estimated 100 to 400 billion stars. So why is this area dark? It’s a region of vast star-forming clouds.

You need a dark sky to see the Great Rift. But if you do see it, know that new stars are being born there, shrouded in their gas-and-dust cocoons.

The Great Rift is dark due to dust – Stars are formed from great clouds of gas and dust in our Milky Way galaxy and other galaxies. When we look up at the starry band of the Milky Way and see the Great Rift, we are looking into our galaxy’s star-forming regions. Imagine the vast number of new stars that will emerge, in time, from these clouds of dust.

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