Maggie is a vast cloud of hydrogen gas observed within our own Milky Way galaxy.

It is a single coherent structure with all parts showing similar velocity with respect to the local standard of rest.

[1][2] It is hoped the cloud will provide clues to one of the earliest stages of star formation.

[3] It was first named by Colombian astronomer Juan D. Soler, an astrophysicist affiliated with the Istituto Nazionale di Astrofisica in Rome, Italy.

He named it after the longest river in his native country, the Río Magdalena (Anglicized: Margaret, or "Maggie").