Edwin Hubble

Astronaut takes Hubble basketball globetrotting

Century-old relic to be passed around on telescope repair mission.


Steve Koppes

Sloan Digital Sky Survey Changes the Face of Astronomy

272 stars gave their lives for the photo spread on cosmic explosions that graced pages 80 and 81 of the March 2007 National Geographic.


Steve Koppes

The Hubble constant, explained

One of the most important numbers in cosmology, the Hubble constant tells us how fast the universe is expanding, which in turn tells us the age of the universe and its history.