The Space Thread -

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  • Emlyn
    Emlyn Posts: 3,869
    And it's likely some of our planet is made up of atoms generated inside the star that exploded:

    https://www.nhm.ac.uk/discover/are-we-really-made-of-stardust.html
  • mhardy6647
    mhardy6647 Posts: 30,842
    NotaSuv wrote: »
    On one of the following days 8/29, 9/2, 9/3 the rocket to the moon will lift off....

    Jeepers, it sounds like all the airline schedules this summer!

    ;)
  • NotaSuv
    NotaSuv Posts: 3,655
    Typical rocket scheduling...last nights launch was scheduled for 7pm and ended up taking off at 10:15 pm. The nighttime launches are spectacular
  • mhardy6647
    mhardy6647 Posts: 30,842
    Yeah, I do realize that -- "launch windows" and all that sort of thing. :)
  • txcoastal1
    txcoastal1 Posts: 12,692
    What’s the carbon footprint of those launches

    More than a pasture of f a r t ing cows?
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  • audioluvr
    audioluvr Posts: 4,628
    The actual launch has none but the massive production to prepare for it is probably quite a lot
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  • Viking64
    Viking64 Posts: 5,884
    Carbon footprint?

    Is that some kind of metaphor or are scientists trying to determine the age of The Bathmat of Turin?
  • Tony M
    Tony M Posts: 10,840
    Time Travel to other galaxy's somewhat simply explained. B)

    Most people just listen to music and watch movies. I EXPERIENCE them.
  • NotaSuv
    NotaSuv Posts: 3,655
    audioluvr wrote: »
    The actual launch has none but the massive production to prepare for it is probably quite a lot

    lol that really depends upon what fuel is being used Space X uses a loaded with carbon fuel while other companies use a zero carbon fuel...LOTS of soot emitted into upper reaches

    Space rockets may not be very environmentally friendly. Space launches can have a hefty carbon footprint due to the burning of solid rocket fuels. Many rockets are, however, propelled by liquid hydrogen fuel, which produces ‘clean’ water vapor exhaust, although the production of hydrogen itself can cause significant carbon emissions.
  • NotaSuv
    NotaSuv Posts: 3,655
    9 pm tonight the 21 million pound Artemis 1 rocket rolls out of VAB and to its launch pad where it will stay until 8/29 first day of the launch window....it's quite an impressive sight to see just sitting on the pad
  • verb
    verb Posts: 10,177
    Roll out is happening now! Slight weather delay. The official webcast is poor, but I found this one.

    https://www.nasaspaceflight.com/2022/08/artemis-1-launch-rollout/

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  • NotaSuv
    NotaSuv Posts: 3,655
    Expectations are well over 100,000 coming into the area to view the launch...we will probably be atop the roof for a good view.....last major launch it took over 3 hours for traffic to clear out....can only imagine the crowds for the next manned launch to the moon
  • verb
    verb Posts: 10,177
    NotaSuv wrote: »
    Expectations are well over 100,000 coming into the area to view the launch...we will probably be atop the roof for a good view.....last major launch it took over 3 hours for traffic to clear out....can only imagine the crowds for the next manned launch to the moon

    Dude I am so jealous that you get to see things like this all the time! For me, it's a bucket list item!
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  • mhardy6647
    mhardy6647 Posts: 30,842
    edited August 2022
    treitz3 wrote: »
    Imagine being able to focus in on the engraved flame of the torch on a dime from 100 miles...

    ...
    The GMT primary mirrors were made at the Steward Observatory Mirror Lab in Tucson, Arizona. They are a marvel of modern engineering and glassmaking; each segment is curved to a very precise shape and polished to within a wavelength of light—approximately one-millionth of an inch...

    I am pretty sure y'all know this, but the wavelength of light depends on its color (or, perhaps more accurately, the color of light is determined by its frequency) -- not really all that different than sound (bass and treble frequencies/wavelengths), although, of course, the speed of propagation is very different :) and light waves are transverse while sound waves are longitudinal.

    Which is actually not why I replied to this post! :p
    Thinking about polishing glass to arbitrary levels of flatness (i.e., danged flat) can be assessed in a crude but surprisingly effective way, especially with flat pieces of glass (e.g., camera lens filters). Remember learning about rings of Newton in high school? B)

    Cool stuff -- a way to visualize incredibly small differences (fractions of a wavelength of visible light). No instruments required! Just eyeballs. Sort of like selecting interconnects or speaker cables. ;)
    https://www.animations.physics.unsw.edu.au/jw/light/Newton's-rings.html
    You can kind of get the idea from this, although these examples are rigged in that one piece of glass is macroscopically not flat. :)

    9ui71rbpypqm.png

    kd1zy35g7l5a.png

    nt8ooh0gisxd.png
    https://www.edmundoptics.com/knowledge-center/application-notes/optics/optical-flats/
    lambda = wavelength
    The wavelength of, say, blue light is very small. The colors we see as "blue" have wavelengths in the range of 450 to 495 nanometers (i.e., 450 to 495 billionth of a meter... don't make me convert that to inches!). that non-flatness of lambda/2 (so, ca. 225 to 247.5 nanometers) is clearly visible. :)
    You can measure extremely small deviations from perfect flatness by the appearance of the pattern when two "flats" are placed together!

    I love stuff like this -- when we can see data from the extremely (!!!) microscopic world... with our own, very macroscopic point of view! :)
    Sorry -- I am a geek-nerd. B)
  • treitz3
    treitz3 Posts: 16,314
    Relatively speaking? One-millionth of an inch variance is still not flat.

    But, I digress....they are curved mirrors, after all.

    Tom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
  • NotaSuv
    NotaSuv Posts: 3,655
    EW YORK -- If you ever dreamed of naming a planet, here is your chance.

    The James Webb Space Telescope is discovering new planets outside our solar system, and now 20 planet names are up for grabs.

    Here are the rules: You can't name a world after yourself or your pet, or give it a religious or military name.

    The contest is open through Nov. 14.

  • mrbigbluelight
    mrbigbluelight Posts: 8,935
    edited August 2022
    Cool !

    So I guess Erectus Maximus is out because of the religious or not name it after yourself restriction
    ...or both
    (in some cases 🤗).

    I'll just let myself out, be back. later to apologize.🥴
    Sal Palooza
  • mhardy6647
    mhardy6647 Posts: 30,842
    Cool !

    So I guess Erectus Maximus is out because of the religious or not name it after yourself restriction
    ...or both
    (in some cases 🤗).

    I'll just let myself out, be back. later to apologize.🥴

    Incontinentia Buttox Buttocks

    fokmxzednqi9.png
  • mhardy6647
    mhardy6647 Posts: 30,842
    ... and what is a military name?
    Sarge?

  • Rear Admiral ? 🤔

    Yes....I think one could do wonders with that .... 🥴🤔
    Sal Palooza
  • pitdogg2
    pitdogg2 Posts: 22,067
    treitz3 wrote: »
    ^^^ Cool shot! ^^^

    I have seen many shots of Jupiter before but never any like the ones MBBL linked from above. The first one is the actual shot. The second one is the shot explained. The Webb NIRCam composite images seen below are from two filters – F212N (orange) and F335M (cyan).

    c62qreo4ysb7.png

    7kooeeebq05r.png

    Tom


    The space nerd on TV this A.M. said taking a picture of Jupiter clearly is very hard because it spins so fast....
  • treitz3
    treitz3 Posts: 16,314
    Odd question...since Jupiter has no surface, how long is a Jupiter day considered?

    Tom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
  • pitdogg2
    pitdogg2 Posts: 22,067
    treitz3 wrote: »
    Odd question...since Jupiter has no surface, how long is a Jupiter day considered?

    Tom

    Tom, I was wondering the same thing.
    I didn't know that it had no surface, I had just thought that it was so inhospitable that anything we send would just get ate up before touchdown.
  • ken brydson
    ken brydson Posts: 8,382
    pitdogg2 wrote: »
    treitz3 wrote: »
    Odd question...since Jupiter has no surface, how long is a Jupiter day considered?

    Tom

    Tom, I was wondering the same thing.
    I didn't know that it had no surface, I had just thought that it was so inhospitable that anything we send would just get ate up before touchdown.

    Kinda like my Seahawks this year. Oops, wrong thread..
  • pitdogg2
    pitdogg2 Posts: 22,067
    pitdogg2 wrote: »
    treitz3 wrote: »
    Odd question...since Jupiter has no surface, how long is a Jupiter day considered?

    Tom

    Tom, I was wondering the same thing.
    I didn't know that it had no surface, I had just thought that it was so inhospitable that anything we send would just get ate up before touchdown.

    Kinda like my Seahawks this year. Oops, wrong thread..

    Like you're surprised! Try the Bears on for size.