. Bigger textures - bigger fun? ok, here is texture I'v found on net: 11k 
texture of the Moon (you can download it from VirtualMoon page at:
http://prdownloads.sourceforge.net/virtualmoon/avlhires_clem.exe?download
Since Celestia can only handle texture that size is multiple of 2, this texture needs to be scaled down to 8k. But still this texture is huge and my graphic card goes wild from this.