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The M4 Planet

M4 is a near globular cluster, so it is one of the oldest compact formations in the universe. In its outer layers a gas planet, which supposedly nearly exclusively consists of hydrogen and helium, orbits a pair of a white dwarf and the neutron star (and pulsar) PSR B1620-26.
The planet has 2.5 times the mass of Jupiter and a distance from the pair of 21.5 AU. Its long, turbulent life began around a yellow main sequence star, which later became the white dwarf. This in turn got captured by the neutron star.

Constellation: Scorpius
Age: 13 billion years
Distance: 7200 light-years

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    The M4 Planet
Graphic: NASA and G. Bacon (STScI)

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