The third Carnival of Space is up at Universe Today. This is a new carnival, and it looks like it might be a weekly affair.

The deadline for the eighth Carnival of Mathematics is also fast approaching. And let’s not forget the 61st Skeptic’s Circle, targeted for 24 May and hosted by the inimitable Skepchicks. In a stunning display of synchronicity, the physical-science carnival Philosophia Naturalis #10 will appear on the same day!