#101
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“This deep field (A/B comparison in an animated GIF), taken by Webb’s Near-Infrared Camera (NIRCam), is a composite made from images at different wavelengths, totaling 12.5 hours — achieving depths at infrared wavelengths beyond the Hubble Space Telescope’s deepest fields, which took weeks.”
https://petapixel.com/assets/upload...vs-hubble-3.gif
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The other day I sat next to a woman who has a profound fear of flying. I wanted to comfort her, so I said, "Don't worry, we're not gonna' crash. Statistically, we got a better chance of being bitten by a shark." Then I showed her the scar on my elbow from a shark attack. I said, "I got this when my plane went down off of Florida." - Dennis Regan |
#102
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The *Real* source of that JWST photo:
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#103
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WHO cares if they slur words ??
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC ! |
#104
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Quote:
EXACTLY right... OL J R
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The X-87B Cruise Basselope-- THE Ultimate Weapon in the arsenal of Homeland Security and only $52 million per round! |
#105
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Quote:
It's an INFRARED telescope, not visible light, so the color of the mirrors isn't important, nor is a tube to keep out stray light. The Gold of the mirrors was used as its the most efficient reflector of infrared energy. NASA has done a terrible job representing this telescope. First off, the way they show it in space is about OPPOSITE of how it's really going to fly... turning the pictures/graphics SIDEWAYS is a better representation. The huge "tennis court" sized SUN SHIELD made out of layers of mylar separated enough to reject heat from one another are designed to shield the mirror array from the SUN. Thus the SUN SHADE WILL ALWAYS POINT TOWARD THE SUN. In fact if the full sun were to shine on the mirror array it would totally screw up the telescope. Webb relies on TOTAL SHADE and the heat rejecting/redirecting properties of the sunshade to keep its mirrors as close to absolute zero as possible, using the thermal radiation cooling principle of the vacuum of deep space. Webb doesn't go "into orbit" around the Earth, it goes to a Sun-Earth Lagrange point 2 (ESL-2) halo orbit about a million miles away from Earth, opposite the sun, with the Earth between it and the sun. It orbits this point about once per year, outlining a long "loop" around this point. The radios to communicate the results and receive instructions are on the sunward side, opposite the mirrors, as well as the solar panel and other gear, the telescope mirrors and instrument package is on the back side (dark side) of the heat shield, soaking in the extreme cold of the vacuum of deep space, so that the instruments remain sensitive to the faint infrared energy the mirrors collect and reflect via the secondary mirror on the three legs into the instrument package behind the primary mirror. Later! OL J R
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The X-87B Cruise Basselope-- THE Ultimate Weapon in the arsenal of Homeland Security and only $52 million per round! |
#106
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Quote:
Basically what they're doing is, to use an Earthbound analogy... imagine you're on the approach to the base of a very tall hill in your car... you want to accelerate to a given speed to give you *just enough* speed to be able to COAST all the way to the top of the hill, but basically be going as close to stopped as possible at the very crest of the hill... The "acceleration" part was provided by the Ariane 5, to get to the *exact* speed they need to coast up out of the Earth's gravity well and into the solar gravity well (hill on a hill basically, or a hill with a steep slope starting out, and a shallower slope halfway up to the top, if you can imagine it that way) and then coast up the rest of the way to the million miles from Earth to the ESL-2 Lagrange point, and arrive there as close to "zero" as they possibly can, to minize fuel usage to thrust into the planned halo orbit... like in the analogy, using as little brake as possible at the top of the hill to keep from rolling over the top and down the other side. Close as I can explain the trajectory mechanics... OL J R
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