Stars are the result of the gravitational collapse of huge clouds of gas and dust, whereas planets are thought to evolve by the accretion of the material left over from such collapses, which forms a rotating disc around the newly created star.

ECONOMIST: Twinkle, twinkle, giant planet

What you see from orbit is a deposit of material in a fan shape that is left over from the explosion.

BBC: Call for public to study Mars images

You could also make these out of left over house-wrap material from Tyvek by asking for scraps from a contractor that is building a home near you.

FORBES: Snip Burn Solder Shred