1. Sunset plus Venus and Pleiades Time lapse

    01:02

    from Duncan Richardson Added 23 1 0

    Sunset plus Venus and Pleiades Time lapse Canon 50D

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    • Eric Michalski's 2012 Timelapse Reel

      01:18

      from Eric Michalski Added 193 3 0

      This is a short compilation of some of the timelapse video I have shot so far this year. I have recently got really interested in timelapse video, especially 'astro timelapse'. I try and shoot timelapse whenever I can no matter what the conditions are. I am currently working on a Urban Timelapse reel so look for that in the next few weeks. -Eric Michalski Photographer emichal@okstate.edu Song: "Hope Overture" -Requiem for a Dream

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      • Yucatan-Stills-Mayan ruins at Dzibanche

        02:35

        from Passage To Productions Added 28 0 0

        This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 10 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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        • Yucatan-Stills-Mayan ruins at Coba

          02:03

          from Passage To Productions Added 15 0 0

          This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 14 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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          • Yucatan-Stills-Mayan ruins at Chicanna

            02:25

            from Passage To Productions Added 24 0 0

            This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 14 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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            • Yucatan-Stills-Mayan ruins at Ek Balam

              03:10

              from Passage To Productions Added 32 0 0

              This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 14 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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              • Yucatan-Stills-Mayan ruins at Chichen Itza

                01:54

                from Passage To Productions Added 34 0 0

                This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 14 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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                • Yucatan-Stills-Mayan ruins at Calakmul

                  02:38

                  from Passage To Productions Added 27 0 0

                  This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 14 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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                  • Yucatan-Stills-Mayan ruins at Becan

                    02:29

                    from Passage To Productions Added 17 0 0

                    This is a compilation of several hundred individual photos shown in a slideshow format. Individual shots are available at resolutions up to 5184 x 3456. We are uploading video for 14 Mayan sites. Educational institutions should contact us for free access to the individual photos.

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                    • Collisions in the Solar System - Margarita Marinova, NASA Ames Research Center

                      33:06

                      from Kavli Frontiers of Science Added 158 0 0

                      Planetary-scale Impacts Margarita Marinova, NASA Ames Research Center The Solar System started out as a cloud of gas, coalescing into kilometer-sized objects, and in the final stages planetesimals – objects a few thousand kilometers across –accreted into the planets we observe today. These last, violent stages of planet formation left behind planetary-sized scars: impact craters thousands and tens of thousands of kilometers across. Such craters are observed throughout the Solar System: Caloris Basin on Mercury, South Pole-Aitken Basin on the Moon, Hellas Basin on Mars, Herschel Crater on Saturn’s moon Mimas, and others. The geophysical consequences of these impacts determine the features we see today. And understanding these impact processes provides insight into their thermal and geochemical consequences for the young planet. We use a three-dimensional Smoothed Particle Hydrodynamics (SPH) model to simulate the impacts and capture the surface curvature of the target, the radial gravity, and the large relative size of the impactor to the planet. We explore impacts into Mars, with energies over two orders of magnitude (1.98x1027 to 5.89x1029 J), impact velocities of 6 to 50 km/s, impact angles from 0° (head-on) to the highly-oblique 75°, and a range of single-composition and differentiated impactors. In all cases the impacts penetrate through and remove the surrounding crust, forming a crater cavity. The resulting crater cavities are about 2,000 to 13,000 km across, equivalent to 9% to more than half (61%) of Mars’ circumference. For these planetary-scale impacts, unlike for smaller impacts, no rim is present around the crater and the crater becomes elliptical at intermediate impact angles. Much of the impact energy is deposited in the mantle of the impacted planet; however, also a significant amount of material is ejected from the planet or put into orbit. The significant momentum of the impact can spin up the planet’s rotation rate to a period of less than a day. Canup, R. M. & Asphaug, E. Origin of the Moon in a giant impact near the end of the Earth’s formation. Nature 412, 708–712 (2001). Chambers, J. E., 2004. Planetary accretion in the inner Solar System. Earth and Planetary Science Letters. 223, 241–252. Marinova, M.M., O. Aharonson, and E. Asphaug, 2011. Geophysical consequences of planetary-scale impacts into a Mars-like planet, Icarus 211, 960-985. Marinova, M.M., O. Aharonson, and E. Asphaug, 2008. Mega-impact formation of the Mars hemispheric dichotomy. Nature 453, 1216–1219. Solomon, S. C. et al. New perspectives on ancient Mars. Science 307, 1214–1220 (2005).

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