images

Oldest known planet in globular cluster M4

by

Nasa/Noao/Aura/Nsf/Novapix

Reference

a-agb61-21002

Date

2006-05-08

Hubble Space Telescope image of stars in globular cluster M4. Marked is a white-dwarf star, which is orbited by the pulsar called PSR B1620-26; this system had been discovered by radio astronomers in 1988. Only the white dwarf is visible in this image. The system has a third companion, it has a mass 2.5 times larger than planet Jupiter, and is thus recognized as a planet.