but that still doesn’t explain the cloud shadows on the rainbow itself It does... but you need to think it through. The partial polarisation of light...

Nail unmanned missions first. The number of unsuccessful launches (red line) seems to have been pretty consistent for the last 30 years: See here.

The A3 is the first example of our strategy to use space as our test bed, and to tolerate failures by building success into the development path. You...

Very interesting meeting at the BAA last night. As the main programme finished earlier than expected, Nick James (who, by the way, was a very deservin...

But now explain this…how the heck do cloud shadows appear on the “rainbow” This is what threw me completely, I have to say... which is why my initial...

One quote that concerned me in the article... In my experience most people want to be entertained rather than educated. Why can't you do both? A...

Well, this isn't a rainbow after all. It's cause by polarised light seen through the plane window. What confused me (and quite a few others) is how th...

Saw this image on the Telegraph website this morning and had to share it here: Taken from a plane at whilst travelling over the Carribean Sea. A st...

It's really interesting to note that not one of the X-class flares has produced a notable coronal mass ejection (CME). A real shame for aurora watcher...

X2.0 solar flare recorded yesterday around 11:00 by the Flamsteed VLF Receiver (see VLF plot under Observing). Could the source be the large sunspot/s...

As its an EF fit, the 20mm should be actual 20mm? It would only be 20mm on a full-frame camera. On your camera, it's the equivalent of a 32mm lens.