Starship Asterisk*

MarkBour wrote:

BDanielMayfield wrote:Have any experiments with fish, mice, etc. been done on the ISS to see if animals can successfully be bred and raised in zero gee?
Bruce

Here's one summary, that seems the clearest I found, if it can be believed (since it is not direct reporting) https://space.stackexchange.com/questio ... d-in-space
There have been a bunch of experiments, and some are in progress on ISS (https://www.nasa.gov/mission_pages/stat ... s/893.html)
although it seems they are going at very specific things with the ISS experiments.

MarkBour wrote:

Chris Peterson wrote:I live at a fairly high elevation, 2800 meters, with the consequence that my skies are very clear and dry, and I see the phenomenon almost every day. I can judge the clarity of the sky by how high the belt gets before it finally disappears- the clearer the skies, the higher it gets.

So, where you're at, with the Sun setting in the West, you would look at it to the East and watch what you call "night rise". I like the term! If you were up before dawn, I don't suppose you're in as good a position to see it in the West, which you might call "night-set"?

geckzilla wrote:

Chris Peterson wrote:I live at a fairly high elevation, 2800 meters, with the consequence that my skies are very clear and dry, and I see the phenomenon almost every day. I can judge the clarity of the sky by how high the belt gets before it finally disappears- the clearer the skies, the higher it gets.

There must be some balance that allows for optimal visibility. It would be totally invisible in a perfect vacuum. Too many particles, and there is too much scattering to see far. Too few, and there's nothing for the light to interact with.

Chris Peterson wrote:I live at a fairly high elevation, 2800 meters, with the consequence that my skies are very clear and dry, and I see the phenomenon almost every day. I can judge the clarity of the sky by how high the belt gets before it finally disappears- the clearer the skies, the higher it gets.

BDanielMayfield wrote:Have any experiments with fish, mice, etc. been done on the ISS to see if animals can successfully be bred and raised in zero gee?
Bruce

Chris Peterson wrote:

BDanielMayfield wrote:

JohnD wrote:You don't have to be 4000 metres high to see the Belt of Venus.

Well that statement is very true. I'm close to sea level and have seen the BoV often, both in the morning and evening.

This phenomenon must often go unnoticed because people's attention is drawn toward the more colorful sunrises and sunsets 180 degrees away.

I live at a fairly high elevation, 2800 meters, with the consequence that my skies are very clear and dry, and I see the phenomenon almost every day. I can judge the clarity of the sky by how high the belt gets before it finally disappears- the clearer the skies, the higher it gets.

Boomer12k wrote:Awesome view... great pic.... is that pollution on the right???

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neufer wrote:

Bill Bryson - A Short History of Nearly Everything wrote:
<<The absolute limit of human tolerance for continuous living appears to be about 5,500 meters, or 18,000 feet, but even people conditioned to living at altitude could not tolerate such heights for long. ...
Moreover, above 5,500 meters even the most well-adapted women cannot provide a growing fetus with enough oxygen to bring it to its full term.>>

Chris Peterson wrote:

JohnD wrote:You don't have to be 4000 metres high to see the Belt of Venus.
Last year I was in Rio for both Olympics. Between the two, on a perfectly clear day, we drove south to beaches on the far side of of the modern sprawl of Barra de Tijuca. On our return in the dusk, driving slowly along the 18kms of Barra beach, I could look directly out to sea (I wasn't driving!) and watch the Belt sink lower and lower, as the sky darkened.

That is a most curious perspective. Surely, as the Sun sets, the Belt rises higher in the sky? That's how I've always seen it; indeed, I often refer to it as nightrise.

Bill Bryson - A Short History of Nearly Everything wrote:
<<The absolute limit of human tolerance for continuous living appears to be about 5,500 meters, or 18,000 feet, but even people conditioned to living at altitude could not tolerate such heights for long. Frances Ashcroft, in Life at the Extremes, notes that there are Andean sulfur mines at 5,800 meters, but that the miners prefer to descend 460 meters each evening and climb back up the following day, rather than live continuously at that elevation. People who habitually live at altitude have often spent thousands of years developing disproportionately large chests and lungs, increasing their density of oxygen-bearing red blood cells by almost a third, though there are limits to how much thickening with red cells the blood supply can stand. Moreover, above 5,500 meters even the most well-adapted women cannot provide a growing fetus with enough oxygen to bring it to its full term.>>

BDanielMayfield wrote:

JohnD wrote:You don't have to be 4000 metres high to see the Belt of Venus.

Well that statement is very true. I'm close to sea level and have seen the BoV often, both in the morning and evening.

This phenomenon must often go unnoticed because people's attention is drawn toward the more colorful sunrises and sunsets 180 degrees away.

JohnD wrote:You don't have to be 4000 metres high to see the Belt of Venus.

JohnD wrote:You don't have to be 4000 metres high to see the Belt of Venus.
Last year I was in Rio for both Olympics. Between the two, on a perfectly clear day, we drove south to beaches on the far side of of the modern sprawl of Barra de Tijuca. On our return in the dusk, driving slowly along the 18kms of Barra beach, I could look directly out to sea (I wasn't driving!) and watch the Belt sink lower and lower, as the sky darkened.