NGC 520, also known as the Flying Ghost,[5] is a pair of colliding spiral galaxies about 105 million light-years away in the constellation Pisces.

Simulations indicate this object consists of two galactic disks that began interacting about 300 million years ago.

[9] The main galactic component is being viewed edge-on, making it fainter in the optical band.

The region of the galaxies outside their nuclei experienced a period of increased star formation roughly around the time they began to interact.

[10] When viewed in the X-ray band, the interacting galaxies appear around half as luminous as expected given their merger state.