A Big Stone from Space — 5.75kg JaH 091 : 無料・フリー素材/写真
A Big Stone from Space — 5.75kg JaH 091 / jurvetson
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | This whole meteorite stone was found in Al Wusta, Oman by a meteorite expert from Poland. From chemical isotope analysis, it has been confirmed as a meteorite — an L5 chondrite called “Jiddat al Harasis 091” in the Meteoritical Bulletin.The dark indentations are regmaglypts — shallow depressions or dimples that form on the surface of some meteorites as they pass through Earth’s atmosphere. They are probably formed by small vortices of hot gas carrying small droplets of molten meteorite that locally erode the surface. See the Macro Zoom details below in comments.It is made of thousands of little spheres called chondrules, molten droplets of silicates that accreted together with some free metals to form the first asteroids 4.55 billion years ago. They are the earliest condensates from the swirling gas disc of our solar system, and preserved in the asteroid belt, having never been absorbed into the molten mass of the planets. They are pristine time capsules from before the planets formed.From my favorite book on the subject, Meteorite, by Tim Gregory: “Billowing through the protoplanetary disc as a mass of brightly glowing droplets of lava, clouds of freshly sintered chondrule grains swarmed for five million years. Trillions upon trillions of chondrules, in numbers that far exceed the number of stars in the observable Universe, spiraled as gravitational vortices, and coalesced to build the asteroids and the planets. What a sight it must have been.” (p.140) |
| 撮影日 | 2022-08-07 14:29:39 |
| 撮影者 | jurvetson , Los Altos, USA |
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| カメラ | Canon EOS 5D Mark IV , Canon |
| 露出 | 0.004 sec (1/250) |
| 開放F値 | f/10.0 |
| 焦点距離 | 50 mm |