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  • Doobie Keebler
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The Cool Science Image Thread


Orbits of Potentially Hazardous Asteroids
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Explanation: Are asteroids dangerous? Some are, but the likelihood of a dangerous asteroid striking the Earth during any given year is low. Because some past mass extinction events have been linked to asteroid impacts, however, humanity has made it a priority to find and catalog those asteroids that may one day affect life on Earth. Pictured above are the orbits of the over 1,000 known Potentially Hazardous Asteroids (PHAs). These documented tumbling boulders of rock and ice are over 140 meters across and will pass within 7.5 million kilometers of Earth -- about 20 times the distance to the Moon. Although none of them will strike the Earth in the next 100 years -- not all PHAs have been discovered, and past 100 years, many orbits become hard to predict. Were an asteroid of this size to impact the Earth, it could raise dangerous tsunamis, for example. Of course rocks and ice bits of much smaller size strike the Earth every day, usually pose no danger, and sometimes creating memorable fireball and meteor displays.

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Re: The Cool Science Image Thread
Reply #1
Which one is named "Trump"?

Plus, obligatory rimshot reply ....

https://www.youtube.com/watch?v=LbvmKzf_wr4


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Reply #5
"If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man."
― Mark Twain

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Reply #6
Needs sound effects ...

Pew, Pew ... Pew

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"If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man."
― Mark Twain

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Reply #11
Shepherd moon?

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Reply #12

Looks like something hit the shit out of that thing at some point

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Reply #13
Hyperion's density and porosity is somewhere between styrofoam and laundry lint. Impacts tend to compress the surface material rather than excavate it.

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Reply #14
Sahara snow from the Modis satellite data  Jan 21 2017



https://worldview.earthdata.nasa.gov/

reference shot from Google Earth

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"If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man."
― Mark Twain

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Explanation: Is that a spaceship or a cloud? Although it may seem like an alien mothership, it's actually a impressive thunderstorm cloud called a supercell. Such colossal storm systems center on mesocyclones -- rotating updrafts that can span several kilometers and deliver torrential rain and high winds including tornadoes. Jagged sculptured clouds adorn the supercell's edge, while wind swept dust and rain dominate the center. A tree waits patiently in the foreground. The above supercell cloud was photographed in 2010 July west of Glasgow, Montana, USA, caused minor damage, and lasted several hours before moving on.

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Explanation: What's happening to the rings of Saturn? Nothing much, just a little moon making waves. The moon is 8-kilometer Daphnis and it is making waves in the Keeler Gap of Saturn's rings using just its gravity -- as it bobs up and down, in and out. The featured image is a wide-field version of a previously released image taken last month by the robotic Cassini spacecraft during one of its new Grand Finale orbits. Daphnis can be seen on the far right, sporting ridges likely accumulated from ring particles. Daphnis was discovered in Cassini images in 2005 and raised mounds of ring particles so high in 2009 -- during Saturn's equinox when the ring plane pointed directly at the Sun -- that they cast notable shadows.

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WHEN LIGHTNING STRIKES  One day last summer, Your Shot photographer David Rankin captured the precise moment a bolt of lighting from a powerful storm hit the Vermilion Cliffs in southern Utah and northern Arizona.

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ITAP: closeup of the engine and solid rocket motors that power the Delta IV Medium+ (5,4) rocket

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This is a closeup image of the Aerojet Rocketdyne RS-68A engine (center engine) and four (two on each side) Orbital ATK GEM-60 solid rocket motors that power United Launch Alliance's Delta IV Medium+ (5,4) rocket. This past Saturday, this Delta IV launched the 9th Wideband Global SATCOM satellite (WGS-9) for the USAF.

I shoot for AmericaSpace as a launch photographer; before most launches from Cape Canaveral, other members of the media and I are escorted to the launchpads on Cape Canaveral Air Force Station to setup "remote" cameras. (I'm not credentialed for all of them--long story.)

This image was taken with a Nikon D3300, Nikon 55-300mm f/4.5-5.6 lens (at 80mm) and was the shot was triggered by a Vela Pop sound trigger, as I watched the launch from ~2.5 miles away; the sound would kill anyone this close. The camera was about 300ft from the rocket, its tripod was staked down using tent stakes, and there was a plastic bag around the camera to protect it from weather and the rocket itself.

Settings: 1/4000 f/13 ISO 100 - many other photographers have successfully executed these shots in the past, and I used their EXIF data as reference, but I opted to underexposed even further to properly expose the extremely bright exhaust. The D3300 has surprisingly good dynamic range and I was able to pull up the shadows in LR.

I've been taking rocket launch images for about two years and have had up-close access for about a year, but this is probably my favorite shot I've ever taken.

Thanks for viewing; feel free to ask anything about the setup or the launch!

Personal stuff below :)

Instagram: @johnkrausphotos - I'm doing the 365 day daily photo challenge after completing it last year. No missed days; feel free to follow for daily content :)

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Flickr, which hosts solely my daily photo images from this year.
  • Last Edit: March 24, 2017, 01:47:55 AM by Doobie Keebler