There are many magazines and publications dealing with Art, Science, Astronomy and SF. Listed below are just a few that caught our eye..

Astronomy (USA)
Sky & Telescope (USA)
Astronomy Now (UK)
The Planetary Society (USA)
The Planetary Society (UK Branch)
British Astronomical Association (BAA)
National Space Society (NSS) (USA)
Society for Popular Astronomy (SPA) (UK)
SETIQuest ~ the search for extraterrestrial life
UK Amateur Astronomy ~ what it says on the tin
National Space Centre ~ based in Leicester, and well worth a visit
European Space Agency (ESA) ~ yes, we do have a space programme!
Ansible ~ terrific, award-winning SF newsletter by David Langford
British Fantasy Society ~ what it says on the tin
Space Explorers ~ Missions for Schools
UK SEDS ~ an extensive programme of astro-related lectures and events
HEASARC ~ another excellent resource
Space Science Institute ~ research, education & info on space projects
Space Futures ~ space tourism? We CAN all go into space!
Spaceguard UK ~ one day, an asteroid WILL hit the Earth; we need to know. . .
Space Settlers Society Speaks for itself ~ plus LOTS more excellent links!
SPACE.com ~ whatever your interest in space, it's here!
Astronomy Links ~ does exactly what it says on the tin. Also linked to...
The Astro Pages~ see above.
Earth & Space Foundation ~ includes 'Visions of the Future': art of space expeditions
Space World ~ Erik Victor's marvellous exhibition
Sky at Night Magazine ~ you watch it on TV, now read it too

SF Magazines:

The Magazine of Fantasy & Science Fiction (F&SF) ~ founded in 1949 and still going (often with Hardy covers)

Analog ~ first published in January 1930 as Astounding Stories of Super-Science. (Also often uses Hardy covers)

Zone SF ~ a new online magazine, featuring SF and non-SF, such as interviews with authors.

(see also other links within these pages)