Recent content by Jonathan Scott

True of course, and presumably relevant in this case, but to avoid confusion this needs to be accompanied by the important point that if the angular size of an individual object (such as a star) is smaller than the sensor or eye resolution then the apparent brightness is decreased accordingly...

Thanks - I knew that the colours were completely artificial and Hubble photos include wavelengths outside the visible spectrum but I had assumed that some similar shape would be visible. (One can for example see the Andromeda galaxy unaided on a dark clear night, which is a lot further away). I...

That's getting a bit off topic, but from some quick Googling, that image is probably of the order of 5 light years high, and the version of the image you've chosen is about 620 pixels high. The angular resolution of the human eye is about 0.0003 radians, so if you for example wanted that to...

The human eye adapts well to darkness, although it doesn't see colour well at low light intensity. The earth was lit by full moonlight. If I just save the darker image and "auto-adjust" colour I get quite a similar result, although the available copy of the darker image is lower resolution, so...

No it isn't. That looks like a launch from complex 40 (Falcon 9) not 39B, but in any case that picture is quoted in a post by Chris Hadfield from 2024.

That article now contains a more realistic acceleration (around speed of sound after a minute) and the following at the end:

I've never liked live classroom lectures, as the speed is rarely right for me. Most of the time it's far too slow, but occasionally I find an interesting point and wish I could think about it more. So from that point of view, I've always preferred learning at my own speed from written materials...

I wish we had someone around here (UK) who wanted my Encyclopaedia Britannica! I've been trying to donate or sell it for years. It's 15th Edition, 1989 revision, plus all year books from 1990 until they stopped in 2012, plus "Science and the Future" volumes and "Medical and Health" volumes...

That brings back long-archived memories! I think I had ids on BITNET and JANET at least. I guess my ids must have expired after I left the Gothenburg Universities' Computing Centre in 1987 to join IBM.

That doesn't sound like an ethical solution to that situation!

I think "exactly" is a clear enough condition here. It means that the result is three equilateral triangles and nothing else.

Ah, it was the fact that the redirect didn't pick up the unread point that confused me. Thanks for the clarification. I did go to "Feedback and announcements" before I posted to see if there had been some deliberate change, but I didn't see any announcement of that change.

At present, the first four threads I see in the General Discussion list have no date or last poster information (they show N/A), and do not automatically go to the next unseen post if I view them, but if I use an email notification link they go correctly to the new post.

What would you think if you got an email with this subject? "Server whether condition's" It was from the company supplying my wife's parents with dairy products, clearly intending to say that their deliveries today might be disrupted due to "severe weather conditions". Education here clearly...

"Columbium" surprised me but on checking I found that's a pre-1950 name for Niobium.