[:ja]アレックス・ゲルスト宇宙飛行士がISSから撮影したサハラ砂漠にあるモーリタニアのトゥヌメクレーターです。
トゥヌメクレーターは3~1万年前に隕石によって作り出されました。直径は1.9㎞で外周は100m程度の高さまでせり上がっており、かつてはこれより数百m深かったようですが、現在は砂で覆われているため、浅くなっています。周辺の地質年代は非常に古く、数億年前のものです。
地上の様子はこちらです。
参考文献： Alex Gerst’s Tweet
地球俯瞰画像を見る： LiVEARTH
[Earthview Wonders] No.683: Tenoumer Crater, Mauritania🇲🇷
Astronaut Alex Gerst captured from ISS Tenoumer Crater, Mauritania in Sahara Desert.
Deep in the Sahara Desert lies a crater. Nearly a perfect circle, Tenoumer Crater is 1.9km diameter, and sports a rim 100m high. The crater sits in a vast plain of rocks so ancient they were deposited hundreds of millions of years before the first dinosaurs walked the Earth. Closer examination of the structure revealed that the crater’s hardened “lava” was actually rock that had melted from a meteorite impact.
The local scenery on the ground is as follows.
Reference: Alex Gersts’s Tweet
See earthview photo gallery: LiVEARTH[:en][Earthview Wonders] No.683: Tenoumer Crater, Mauritania🇲🇷
Astronaut Alex Gerst captured from ISS Tenoumer Crater, Mauritania in Sahara Desert.
Deep in the Sahara Desert lies a crater. Nearly a perfect circle, Tenoumer Crater is 1.9km diameter, and sports a rim 100m high. The crater sits in a vast plain of rocks so ancient they were deposited hundreds of millions of years before the first dinosaurs walked the Earth. Closer examination of the structure revealed that the crater’s hardened “lava” was actually rock that had melted from a meteorite impact.
The local scenery on the ground is as follows.
Reference: Alex Gersts’s Tweet
See earthview photo gallery: LiVEARTH[:]