The Small Magellanic Cloud (SMC) is a dwarf galaxy near the Milky Way. Classified as a dwarf irregular galaxy, the SMC has a D25 isophotal diameter of about 5.78 kiloparsecs (18,900 light-years), and contains several hundred million stars. It has a total mass of approximately 7 billion solar masses. At a distance of about 200,000 light-years, the SMC is among the nearest intergalactic neighbors of the Milky Way and is one of the most distant objects visible to the naked eye.
Panoramic Large and Small Magellanic Clouds as seen from ESO's VLT observation site. The galaxies are on the left side of the image.
VISTA's view of the Small Magellanic Cloud. 47 Tucanae (NGC 104) is visible to the right of the Small Magellanic Cloud.
The Small Magellanic Cloud pictured by the Hubble Space Telescope
Henrietta Swan Leavitt was an American astronomer. Her discovery of how to effectively measure vast distances to remote galaxies led to a shift in the scale and understanding of the scale and the nature of the universe. Nomination of Leavitt for the Nobel Prize had to be halted because of her death.
The observatory at Harvard where Henrietta Swan Leavitt worked
Henrietta Leavitt (third from left) is shown working among "The Harvard Computers" who assisted astronomer Edward Charles Pickering at the Harvard College Observatory. The assistants also included Annie Jump Cannon, Williamina Fleming, and Antonia Maury.
Leavitt working at her desk in the Harvard College Observatory