Difference Images, 8.3 days Showing Variable Stars (Alas No Planets)

Hubble Sees a Vast "City" of Stars

In these pictures, a "city" of a million stars glitters like a New York City skyline. The images capture the globular cluster 47 Tucanae, located 15,000 light-years from Earth in the southern constellation Tucana. Using NASA's Hubble Space Telescope, astronomers went hunting in...

Globular Cluster 47 Tucanae, Home to 35,000 Stars

47 Tucanae

A Planet's Telltale Signature

This diagram illustrates how a planet passing in front of a star blocks a tiny amount of starlight. In this case, it's a planet crossing the face of a nearby star called HD 209458, located 153 light-years from Earth in the constellation Pegasus. The dip in the center of the...

Zoom-in to HST Image of 47 Tucanae