# Why does the Sagan-Drake pulsar map have a circle (negative/blank) near the center?

(click to enlarge, source: WikiMedia)

If you look carefully near the center, each of the pulsar line segments have a gap at a specific radius. I can't find any mention of the meaning of this. Any ideas?

• In case your hot-link breaks: here's an imgur of original i.stack.imgur.com/6HFFB.jpg at en.wikipedia.org/wiki/File:Pioneer10-plaque.jpg – uhoh Oct 24 '20 at 13:52
• @Glorfindel I voted to reject your edit. The reason I left the post alone is that I figured the OP left it out intentionally. If they want to include it the link is available in my comment, but in this case I think it's their decision. – uhoh Oct 24 '20 at 16:16

It's clearly not an artefact of the SVG vectorised file on Wikipedia. A photograph of the Voyager Golden record (which features the same map), shows the same gap.

Using this to decode the pulsar map, the distance of the most similar pulsar can be established (280 parsecs)