Globular cluster 47 Tucanae houses thousands of stars and is the second brightest cluster in the sky after Omega Centauri. This Hubble image shows white dwarf stars, concentrated in the center of the picture, migrating to the cluster's outskirts.
Week's Best Space Pictures: Tornadoes Wreak Havoc And Galaxies Shine
Satellites capture a wild week in Earth's atmosphere, and telescopes capture galaxies in all their shining glory in this week's most amazing views from space.
Feed your need for "heavenly" views of the universe every Friday with our picks for the most awe-inspiring space pictures. This week, severe storms pound the U.S., Mars gets a sandblasting, and a moulin drains an ice sheet.