Joseph Michael Tucciarone has been producing space art and dinosaur illustrations for more than twenty years, and is now producing fantasy art. His science illustrations have been commissioned by National Geographic and TIME magazines, and his images have also been used by Encyclopedia Britannica, Microsoft, Discovery Channel Online and Dream Works Productions. He has an Honorary Doctor of Science degree and is a Fellow of the International Association of Astronomical Artists (IAAA). Below are a few examples of his artwork (from Space.com).
Note: All artwork and images copyright © Joe Tucciarone. Please do not use images without the permission of the artist.
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Offisial website and gallery: The Space Art of Joe Tucciarone. There are the complete collection of Joe Tucciarone's site, but many of them are unfortunately a bit small to get a real feeling for his work.