Hellas Planitia

Hellas Planitia - Video Learning - WizScience.com

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• published: 02 Sep 2015
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"Hellas Planitia" is a plain located within the huge, roughly circular impact basin Hellas located in the southern hemisphere of the planet Mars. Hellas is the second or third largest impact crater and the largest visible impact crater known in the Solar System. The basin floor is about 7152 m deep, 3000 m deeper than the Moon's South Pole-Aitken basin, and extends about 2300 km east to west. It is centered at Hellas Planitia is in the Hellas quadrangle and the Noachis quadrangle. With a diameter of about 2300 km, it is the largest unambiguous impact structure on the planet, though a distant second if the Borealis Basin proves to be an impact crater. Hellas Planitia is thought to have been formed during the Late Heavy Bombardment period of the Solar System, approximately 4.1 to 3.8 billion years ago, when a large asteroid hit the surface. The altitude difference between the rim and the bottom is 9000 m. The depth of the crater below the standard topographic datum of Mars) explains the atmospheric pressure at the bottom: 12.4 mbar during the northern summer . This is 103% higher than the pressure at the topographical datum and above the triple point of water, suggesting that the liquid phase could be present under certain conditions of temperature, pressure, and dissolved salt content. It has been theorized that a combination of glacial action and explosive boiling may be responsible for gully features in the crater. Some of the low elevation outflow channels extend into Hellas from the volcanic Hadriacus Mons complex to the northeast, two of which Mars Orbiter Camera images show contain gullies: Dao Vallis and Reull Vallis. These gullies are also low enough for liquid water to be transient around Martian noon, if the temperature would rise above 0 Celsius. Wiz Science™ is "the" learning channel for children and all ages. SUBSCRIBE TODAY Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK. Background Music: "The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library. This video uses material/images from https://en.wikipedia.org/wiki/Hellas+Planitia, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.