Those nifty shine-lines on some of the stars are from the Blender Compositor’s Glare Node, recommended in last week’s thread by Xeofrios! I uploaded the .blend file at the bottom of my entry post, take a look.
As for the reddish shade on those stars, it’s not supposed to be there and I have no idea how it got there. The two compositor effects on that backdrop are that glare node and a little bit of blur from a blur node – the backdrop itself is an emission node fed by a noise node controlling black-to-white color ramp, and it’s on a different view layer from Suzanne so it couldn’t’ve picked up any reflected orange. I’ve no clue, sorry.