Recent content by Andy Resnick

Not many clear nights lately, but I managed to get a reasonable image in the region of IC 434 (Horsehead Nebula in Orion): Nikon D810 + Nikkor 400/2.8, shot @ f/4 on Losmandy GM-8, 10s subs 25h total integration time, stacking and post processing with AstroPixelProcessor. This region of the...

Based on the copious iron oxides, ferro-carbonatite/Rodberg chilled margin with country rock, Fen complex: Gneiss is anhedral and consists of quartz, K-feldspar, and some plagioclase (monzogranite on the QAPF diagram). Phenocrysts of apatite as well as grains of unaltered ferro-carbonatite...

The Sci. Am. article references this journal article by Witten et. al: "But in a 2023 paper, a team of physicists, including the great theoretician Edward Witten, added an observer with a quantum clock to their treatment of a black hole and were surprised to find the gnarly math became simpler...

I am an RPI grad (class of 1991), physics major. While the academics are quite demanding and the city is a pit of despair (the book "Upstate Girls: Unraveling Collar City" brings back a lot of memories...), I had a lot of great experiences, including "real" summer research projects...

The snow and cold have been unrelenting here as well- the landscape is bleak and desolate :) 15mm f/2.8 shot @ f/11, 10s auto ISO. The camera is about 2 feet off the ground and 1 meter from the stop sign. Yes, I mixed units... A crop from the center of this image turned out to be much...

Don't you think the OP should be answering my question?

Are the scripts intended as a replacement for a textbook? Is there a textbook? You mentioned the scripts "have no structure", I'm trying to understand if that is a bug or a feature.

I'm a little confused- what are 'scripts'? I've not heard that term. Also, if this makes sense, how do scripts relate to homework problems and test questions?

The moon and jupiter are close enough to capture @ 400mm (about 7 degrees separation), I "helpfully" magnified jupiter pasted it on to better see the detail, one exposed to see the lunar and planetary details, and another exposed to show the 4 galilean moons:

Chilled margin of carbonatite magma and country rock (telemark gneiss). Interestingly (to me, anyways), the gneiss is anhedral, and it’s easy to imagine that the magma permitted relaxation of grain boundaries through annealing. Carbonatite magma has physical properties very different...

If I understand you, that is correct. What is different between the two is the mechanism by which mobile electrons are created.

More solid water photos, all using 55mm MicroNikkor: I find the clear transitions between linear and curvilinear dedritic growth fascinating- all I know about dendrites is what I followed of Martin Glicksman's spaceflight experiments using succinonitrile, and I don't recall ever seeing...

In fact, it was once thought that flying can be curative: https://www.smithsonianmag.com/history/doctors-once-prescribed-terrifying-plane-flights-cure-deafness-180965027/

Or perhaps a wee dram of whisky :)

Frozen Plateau-Rayleigh instability (icicle):