Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Our Beautiful Universe - Photos and Videos

  1. Feb 15, 2017 #221

    DennisN

    User Avatar
    Gold Member
    2017 Award

    Thanks a lot, Andy! :) I will check it out!
     
  2. Feb 15, 2017 #222

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Another clear night- now up to 1h 13m integration time. Noticeable improvement!

    1h_13m_filtered_zps5ymqajn0.jpg
     
  3. Feb 15, 2017 #223

    DennisN

    User Avatar
    Gold Member
    2017 Award

    Definitely! Very, very nice! :woot: I particularly like the bottom left "cloudy" part of your image.
     
  4. Feb 15, 2017 #224

    DennisN

    User Avatar
    Gold Member
    2017 Award

    @Andy Resnick, I took the liberty of downloading your image and playing around with it, because 1) I liked the image and 2) I took a pause from a really boring task I am currently doing :smile:. Are you doing any more post processing with your images? Because you can of course:

    1) enhance detail with "autocontrast" and "autotone" (Photoshop):

    32886266476_dacbfb7519_c.jpg

    2) and enchance colors with "vibrance" and "saturation" (Photoshop): (or we can call it "Hubblefilter", haha :biggrin:)

    32886266406_a3366351af_c.jpg

    EDIT:

    3) and even more vibrance and saturation, maybe over the top?

    32802905331_c342ae9d13_c.jpg
     
    Last edited: Feb 15, 2017
  5. Feb 16, 2017 #225

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Sure- feel free to edit away :)

    Here's my overall workflow: Stacking results in 32-bit/ch images, so the first step is to compress that to a 16-bit/ch image. I essence, I compress the image by applying an extreme gamma correction that approaches a step function. Then, I fine-tune the 16-bit/ch image with ImageJ- background subtraction, gamma, stuff like that, and then convert to an 8-bit/ch HSB image and perform a final set of corrections to the S and B channels as needed before generating the final 8-bit/ch RGB, and run a CLAHE routine to boost local contrast variations. Finally, I sometimes use Neat Image to reduce noise. It may seem like a lot, but after stacking, everything takes about 1 hour. I discuss some of this in greater detail in the 'astrophotography' insights.

    As I've discussed before/elsewhere, I am very cautious about any color re-balancing. I try and set the background to neutral grey and the brightest stars to pure white, but for whatever reason, each channel seems to have a slightly different gamma, meaning the midtones are subject to off-color casts. I don't trust my eyes or monitor to set a neutral grey.
     
  6. Feb 22, 2017 #226

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Honestly, it's hard to get exercised about global warming when I'm outside in shorts and a t-shirt in mid-February. In Cleveland, OH. 'Normally', there's 3 feet of months-old snow and it's -20 with wind chill.

    1h_36m_small_zpscyl0wlob.jpg

    1 h 36 m total integration time, 400/4, ISO 500.
     
  7. Feb 22, 2017 #227

    DennisN

    User Avatar
    Gold Member
    2017 Award

  8. Feb 23, 2017 #228

    DennisN

    User Avatar
    Gold Member
    2017 Award

    NASA & TRAPPIST-1: A Treasure Trove of Planets Found
    "Published on Feb 22, 2017
    Seven Earth-sized planets have been observed by NASA's Spitzer Space Telescope around a tiny, nearby, ultra-cool dwarf star called TRAPPIST-1. Three of these planets are firmly in the habitable zone."


    NASA full press conference on discovery of 7 Earth-like exoplanets
    "Published on Feb 22, 2017
    NASA scientists announced Wednesday that they had discovered seven Earth-sized exoplanets 40 light years away, three of which may be able to sustain life."


    Various links:
    4_cover_pia21421-png.png
     
    Last edited by a moderator: May 8, 2017
  9. Mar 1, 2017 #229
  10. Mar 10, 2017 #230

    DennisN

    User Avatar
    Gold Member
    2017 Award

    A nice photo from Mars Reconnaissance Orbiter:

    Isidis Basin Ejecta
    "This scene is a jumbled mess. There are blocks and smears of many different rocks types that appear to have been dumped into a pile."
    http://www.nasa.gov/image-feature/jpl/pia21553/isidis-basin-ejecta
    A large image is here.

    Two bonus clips from ISS:

    Wringing out Water on the ISS - for Science!
    "2013-04-16 - CSA Astronaut Chris Hadfield performed a simple science experiment designed by grade 10 Lockview High School students Kendra Lemke and Meredith Faulkner. The students from Fall River, Nova Scotia won a national science contest held by the Canadian Space Agency with their experiment on surface tension in space using a wet washcloth."


    (this may have been posted previously in the thread, I can't remember at the moment :wink::)
    4K Video of Colorful Liquid in Space
    "Once again, astronauts on the International Space Station dissolved an effervescent tablet in a floating ball of water, and captured images using a camera capable of recording four times the resolution of normal high-definition cameras."
     
  11. Mar 10, 2017 #231

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    M51 is coming into view over here...

    3X_DX_50m_filtered_zpssxy6gp2c.jpg

    50 minutes @ ISO 1000, 400/2.8.
     
  12. Mar 14, 2017 #232

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Orion is moving out of view, this is the longest exposure as I could get (until next year): 2 h @ 400/2.8, ISO 1250.
    1h%2053m%20DX_DX1.TIF%20RGB_filtered1_small_zpsz9pgheir.jpg
     
  13. Mar 14, 2017 #233
    That is a beautiful shot. :thumbup:
     
  14. Mar 15, 2017 #234

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Thanks!
     
  15. Mar 17, 2017 #235
  16. Mar 20, 2017 #236

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    These are amazing:


     
  17. Apr 3, 2017 #237

    DennisN

    User Avatar
    Gold Member
    2017 Award

    Very nice clips, thanks!
     
  18. Apr 21, 2017 #238

    DennisN

    User Avatar
    Gold Member
    2017 Award

    Oh, this channel is really cool... (* see note below)
    NASA Live - Earth From Space LIVE Feed
    Started streaming on Oct 22, 2016
    Live video of Earth from space - as seen from the Nasa ISS live stream aboard the International Space Station.



    (*) EDIT: Here's the original live stream (I think):

    NASA Live_ISS_Stream
    http://www.ustream.tv/channel/live-iss-stream

    I've checked it just now, and it currently shows a blue page, which makes me doubt that the youtube link above really is live (* see note below). My guess is that the ISS currently is orbiting on the night side of Earth. Well, the ustream probably stream live from time to time, and there are also recorded streams on that page.

    (*) EDIT 2:
    Confirmed. According to http://iss.astroviewer.net/ as of right now this is/was the position of ISS:

    33362658313_099ba3c450_b.jpg
     
    Last edited: Apr 21, 2017
  19. Apr 21, 2017 #239

    DennisN

    User Avatar
    Gold Member
    2017 Award

  20. Apr 28, 2017 #240

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    The constellation Virgo is well-placed for viewing this time of year- there's a large supercluster of galaxies that is pretty amazing to image. First two are full-frames shots of the area, followed by a 1:1 cropped "rogue's gallery' of the more photogenic galaxies. Each full-frame is about 1h integration time @ 400/2.8, ISO 1000.

    Virgo_5_1h_20m_filtered-1_zps6gjujyg6.jpg
    Virgo_7_1h_19m_filtered-1_zpsszho6rgb.jpg

    Untitled_1_zpsbpdoz4qz.jpg
    Untitled_2_zpscjhhhcin.jpg
    Untitled%2034_zpsy5rmsuj3.png
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted