This NASA/ESA Hubble Space Telescope image shows the center of globular cluster M 4. The power of Hubble has resolved the cluster into a multitude of glowing orbs, each a colossal nuclear furnace. M 4 is relatively close to us, lying 7200 light-years distant, making it a prime object for study. It contains several tens of thousands stars and is noteworthy in being home to many white dwarfs—the cores of ancient, dying stars whose outer layers have drifted away into space.
In July 2003, Hubble helped make the astounding discovery of a planet called PSR B1620-26 b
, 2.5 times the mass of Jupiter
, which is located in this cluster. Its age is estimated to be around 13 billion years—almost three times as old as the Solar System
! It is also unusual in that it orbits a binary system of a white dwarf and a pulsar (a type of neutron star
The Daily Galaxy via NASA
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