Postal Service pays tribute to astronomer Edwin Hubble

What: Chicago unveiling of commemorative stamp honoring University of Chicago alumnus Edwin Hubble.

Who: Edward "Rocky" Kolb, Professor and Chairman,Department of Astronomy and Astrophysics, University of Chicago

James Mruk, Manager, Public Affairs and Communications, Great Lakes Area of the United States Postal Service

When: Wednesday, April 30th, 3 p.m.

Where: Research Institutes building, 5640 S. Ellis Ave., Room 480

Why: In March, the U.S. Postal Service acknowledged some of the most impressive scientific achievements of the 20th century with the issue of its second series of American Scientists stamps. Astronomer Edwin Hubble (1889-1953), alumnus of the University of Chicago (S.B., 1910, Ph.D., 1917), played a pivotal role in deciphering the vast and complex nature of the universe. His meticulous studies of spiral nebulae proved the existence of galaxies other than our own Milky Way, paving the way for a revolutionary new understanding that the cosmos contains myriad separate galaxies or “island universes.”

The local unveiling of the Edwin Hubble stamp will take place before the weekly colloquium of the University’s Department of Astronomy and Astrophysics.