As I said in the title, I'm not quite sure what to call this.
So, I was messing around with planets and stars, when I noticed the background was white. I didn't notice until then, but I decided to zoom out, to see if there was something there.
Then. I see this. ITS HUGE. I zoomed out quite a lot to see this. To be accurate, I think I saw this appear when I smashed two suns into each other. More specific, I launched both suns AT each other using 8 on the keyboard. Has this happened to anyone else? My Log file is attached at the bottom.