Well, it looks like the sky might be clear enough to get a few pictures of the so called "SuperMoon" rising tonight. I shall pop out to Blackheath at...

Is it worthwhile trying to do a one hour time lapse with my rather slowish 18-55mm f3.5-5.6 stock Canon lens? I think f/3.5 should be fine. I'd keep ...

Excellent. Now I understand. So 1 donkeypower* = 250,000,000,000,000,000 femtowatts. All makes sense now :) * Wikipedia defines 1 Donkeypower as 2...

WTF is a femptowatt!! Far too small for me to contemplate. I can't event get decent mobile reception if I move from one room to the other in my house...

Interesting the way you can see the Noctilucent Clouds moving in the opposite direction to the ‘normal’ clouds… Great spot! I hadn't really noticed t...

Mike, for Christmas we’ll get you the mathematical formula plug-in. Difficult to follow, isn't it? Try this...

Oh, go on, Mike. Treat yourself – and us! If you insist :) You can look at this as a three-body problem e.g. the Sun, the planet and the satellite. ...

Great article from Stuart. I remember the live TV programme about the Giotto mission to Halley's Comet very well. It certainly didn't make for good TV...

I believe that Rosetta has used 4 gravity assists to get to the comet - 3 of the Earth and 1 of Mars. As Brian says, it was the only way of getting to...

Live coverage of the rendezvous now:

Unfortunately, our members solar viewing session planned for this evening has been cancelled. With these events, we have to give the museum 24 hours ...

Can the private sector do it better than over-regulated government agencies That may be the one possibility. Our attitude towards risk has got to th...