1. Yellowstone Milky Way Night Sky Astrophotography

    by , 11-22-2014 at 06:21 PM
    There are astrophotos from my trip to Yellowstone national park. During this time weather was not good, totally cloudy and most of the time it was raining. Just last night for couple of hours sky all the sudden was clear and I was happy and get chance to made couples of photos.

    Yellowstone night sky is amazing and fantastic! Looks like you are on the other planet. Do you believe that the Milky Way was not created by a geyser?


    Updated 12-13-2014 at 03:33 AM by astroval

  2. Partial Solar Eclipse November 3 2013 New York City

    by , 11-22-2014 at 05:51 PM
    Click image for larger version. 

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    A Solar Eclipse of November 3, 2013 as seen from New York City near JFK Airport. The photos were taken with a camera Canon 40D.

    Click image for larger version. 

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    Photos just as is with minimum or no post processing.

    Click image for larger version. 

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    Solar eclipses not so often happen in NY City, especially for last years. So wake up early to see this rear event. In the beginning I thing do observation from Staten ...

    Updated 12-13-2014 at 04:55 AM by astroval

    Astrophotography , Solar Eclipse
  3. OffAstrophotography

    by , 08-13-2014 at 01:36 AM
    Astrophotography is photography of astronomical objects and large areas of the night sky. Off-Astrophotography is photography of night sky when the sky or not in the focus or when weather is not good. Off-Astrophotography and Astrophotography something like Off-Broadway and Broadway.

    There are some Off-Astro Photos.


    Updated 08-17-2014 at 03:04 AM by astroval

    Astrophotography , OffAstrophotography
  4. Cosmological constant, age of Universe, radius of observed Universe

    by , 02-07-2013 at 02:35 AM
    I just collect different ways how we can get cosmological constant Λ

    If we had a telescope big enough to see 15 billion light years away.....?-cosmologicalconstant2.jpeg

    From Einstein field equations

    cosmological constant Λ has dimension 1/m2 and is about Λ ≈ 10−52 1/m2. Compare this value with radius of observable Universe R ≈ 14 gigaparsecs (46 billion light years or 4.3×1026 meters) we get that Λ ≈ 1/R2 very close!!!

    Updated 11-24-2014 at 03:51 AM by astroval

    Astrophysics , Black Hole
  5. Newton's law from third Kepler's law

    by , 12-31-2012 at 02:20 AM
    Idea of Newton's law of universal gravitation - "every point mass in the universe attracts every other point mass inversely proportional to the square of the distance between them" can be received from third Kepler's law. Let me show it more detail.

    Kepler's third law is "The square of the orbital period ...

    Updated 04-24-2013 at 02:45 AM by astroval

    Attached Thumbnails Attached Thumbnails how much more can you see with a 90mm over a...-centripedal-316x300.png   how much more can you see with a 90mm over a...-centripetalaccelaration.gif  
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