Milky Way

Milky Way

The Milky Way is the galaxy that contains our Solar System. The Milky Way is a barred spiral galaxy some 100,000–120,000 light-years in diameter, which contains 100–400 billion stars. It may contain at least as many planets as well. The Solar System is located within the disk, about 27,000 light-years away from the Galactic Center, on the inner edge of one of the spiral-shaped concentrations of gas and dust called the Orion Arm. The stars in the inner ≈10,000 light-years form a bulge and one or more bars that radiate from the bulge. The very center is marked by an intense radio source named, Sagittarius A*, which is likely to be a supermassive black hole. Stars and gases at a wide range of distances from the Galactic center orbit at approximately 220 kilometers per second. The constant rotation speed contradicts the laws of Keplerian dynamics and suggests that much of the mass of the Milky Way does not emit or absorb electromagnetic radiation. This mass has been given the name “dark matter”. The rotational period is about 240 million years at the position of the Sun. The Galaxy as a whole is moving at a velocity of approximately 600 km per second with respect to extragalactic frames of reference. The oldest known star in the Galaxy is at least 13.6 billion years old and thus must have formed shortly after the Big Bang. Surrounded by several smaller satellite galaxies, the Milky Way is part of the Local Group of galaxies, which forms a subcomponent of the Virgo Supercluster.

Posted by pcbackup154 on 2014-06-17 16:27:25

Tagged: , abstract , airglow , argentina , astrophotography , canon , computer , deepsky , dream , galaxy , high , landscape , light , map , meade , mendoza , milkyway , music , nature , night , nightglow , nightphotography , nikon , photoshop , planet , process , stacker , stars , sun , time , way

*re-uploaded* Focus stack of Phidippus otiosus – adult male

*re-uploaded* Focus stack of Phidippus otiosus - adult male

Re-processed and uploaded 11/10/09 – First try at Zerene Stacker. Two images. I first tried another picture that was four images, more poorly lined up, and my computer completely refused to finish them; when it finally did, they came out with so many artifacts it was awful. The alignment tool doesn’t work too well apparently, so in the future I think I’ll try cropping them all to line them up better. This shot still took awhile for my wheezing old PC (1gb ram); even with every other unnecessary program turned off, it still froze on me a couple times. So until I get it sped back up, don’t expect many of these type of images. That said, I do like the results. The important face and other areas lined up quite well; although there are a few artifacts still (the hairs on his front legs doubled a bit, and every bit of dust on my image sensor was cloned during alignment so I ended up cleaning twice as much junk!). Still pretty pleased with the results, now if only I could fix the damage to his right anterior median eye 🙂

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Thanks to Thomas Shahan for helping with ID – I could tell this wasn’t P. audax, but it was the first of this species I’ve ever seen. Phidippus otiosus – another one to add to my list of species found. I made the actual list now, and there’s a current version on the main page for my Salticidae set. Turns out I had a few incorrect IDs, and was able to pin others down, so I also changed a few titles and descriptions on other jumper photos to reflect that. Still have to finish changing tags, but I’ll get around to it soon.

Found down in some tree bark in Mohawk Park. I love the iridescent facial scales on this jumper, as well as his incredibly heavy proportions. Such an impressive-looking spider, as well as a new species for me! I had to re-photograph him to get some shots I was pleased with. The green was a much more complimentary backdrop for this individual as well, I’m trying to decide whether to delete the other shots. I wish there was a "scrap folder" option on flickr, so people who’ve collected or commented it wouldn’t be inconvenienced.

Nikkor 18-55 reversed (at ~20mm), Nikon SB-400 and folding diffuser, homemade flash bracket.

Posted by Sam Martin (abikeOdyssey) on 2009-11-08 21:05:14

Tagged: , adult , male , nikon , d60 , nikkor , spider , arthropod , arachnid , chelicerae , leg , legs , eyes , pedipalps , female , macro , Macro-Life , invertebrate , salticidae , salticid , jumper , jumping , poor-man’s , reversed , lens , backwards , notyournormalbug , phidippus , otiosus , Phidippus otiosus , zerene , stacker , focus , stack