Oldest Known Planet
Photograph courtesy NASA/Brad Hansen (UCLA)/Harvey Richer (UBC)/Steinn Sigurdsson (Penn State)/Ingrid Stairs (UBC)/Stephen Thorsett (UCSC)
Bright-blue Earth looms over the oldest known planet in the Milky Way. The ancient planet is thought to be about 13 billion years old, more than twice as old as Earth and a mere billion years younger than the estimated age of the universe. Its discovery, made using NASA's Hubble Space Telescope, is evidence that planets began forming soon after the big bang and may be very abundant in our galaxy.