[1] It is relatively close to Earth, allowing astronomers to observe and study the remnant.

The orange-red filaments visible in the image show the shock fronts of the initial supernova explosion.

The filaments also show that the explosion is no longer expanding as a sphere, but is elliptical in shape.

A double-ring structure is visible within N103B, implying that it expands into an hourglass-shaped cavity and forms bipolar bubbles.

Using the Chandra Telescope, astronomers observed N103B to figure out the initial supernova type.