Planetary geomorphology: Some historical/analytical perspectives

Baker, Victor R.

doi:10.1016/j.geomorph.2014.07.016

Cited by 13 publications

(7 citation statements)

References 90 publications

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“…After decades of arguing whether Mars was water-rich or not, discoveries of the last decade or so have completely eliminated the not (Baker, 2014c). It is no longer necessary or even reasonable to invoke nonaqueous mechanisms for explaining fluvial features on Mars because of physical and chemical models that purport to demonstrate the not (e.g., Hoffman, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Until the later 1990s, channels and valley networks cut into rock had comprised the main evidence that was cited in support of the view that Mars once had conditions that supported an earthlike hydrological cycle. The view of a water-rich planet sharply contrasted with current conditions on the planet and with the then-prevailing views from physics and chemistry that Mars had always been cold and dry (Baker, 2014c). However, starting in the late 1990s, a rapid succession of discoveries added to the list of evidence for more earthlike hydrological conditions on early Mars.…”

Section: Alluvial Rivers Deltas and Sedimentary Rocksmentioning

confidence: 98%

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Fluvial geomorphology on Earth-like planetary surfaces: A review

et al. 2015

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Morphological evidence for ancient channelized flows (fluvial and fluvial-like landforms) exists on the surfaces of all of the inner planets and on some of the satellites of the Solar System. In some cases, the relevant fluid flows are related to a planetary evolution that involves the global cycling of a volatile component (water for Earth and Mars; methane for Saturn's moon Titan). In other cases, as on Mercury, Venus, Earth's moon, and Jupiter's moon Io, the flows were of highly fluid lava. The discovery, in 1972, of what are now known to be fluvial channels and valleys on Mars sparked a major controversy over the role of water in shaping the surface of that planet. The recognition of the fluvial character of these features has opened unresolved fundamental questions about the geological history of water on Mars, including the presence of an ancient ocean and the operation of a hydrological cycle during the earliest phases of planetary history. Other fundamental questions posed by fluvial and fluvial-like features on planetary bodies include the possible erosive action of large-scale outpourings of very fluid lavas, such as those that may have produced the remarkable canali forms on Venus; the ability of exotic fluids, such as methane, to create fluvial-like landforms, as observed on Saturn's moon, Titan; and the nature of sedimentation and erosion under different conditions of planetary surface gravity. Planetary fluvial geomorphology also illustrates fundamental epistemological and methodological issues, including the role of analogy in geomorphological/geological inquiry.

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Section: Discussionmentioning

confidence: 99%

Section: Alluvial Rivers Deltas and Sedimentary Rocksmentioning

confidence: 98%

Fluvial geomorphology on Earth-like planetary surfaces: A review

et al. 2015

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“…Drainage pattern changed from the basic pattern, but the general pattern remains dependent on the underlying pattern. The characteristics of the basic drainage pattern and its modification are in Table 4 [22,23].…”

Section: Radialmentioning

confidence: 99%

Landslide geomorphology evaluation and geology structure analysis at Riau-West Sumatra highway in km 89-94

et al. 2019

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The research area is in the location hit by landslide frequently. Located in Riau-West Sumatra Highway in Km 89-94, Pangkalan Sub District, Lima Puluh Kota District, West Sumatra Province. The research objective to analyse the geomorphological conditions, which is relevance an increased vulnerability to landslides in the study area. The method used consist of geomorphology analysis using morphometric, morphography and morphogenetic parameters. The results of the analysis concluded that the geomorphology of the reserach area is classified into two: High Hills Steep Structural Geomorphology Unit (S2) dominates in all regions and Slightly Steep Hills Denudational Geomorphology Units (D3) is located in the Northeast, the percentages of distribution are 83%, and 17% respectively. Drainage pattern classified to parallel system. Lithology constituent consisting of claystone, siltstone, sandstone, and andesite. Structural geology analysis of joint show trend pattern to the Northwest -Southeast.

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“…With the advent of the space age came the ability to search for life on other worlds in situ with robotic spacecraft. The Martian exploration of Mariner 9 in 1972 opened the door to the debate about the possible existence of liquid water on the surface of Mars in the past or beneath the surface during the present (Dick 2006; Baker 2014). Subsequent missions confirmed Mars’ aqueous past and current subsurface water ice (Head et al 1999; Lunine et al 2003; Squyres et al 2004; Dohm et al 2007; Carrozzo et al 2009; Williams et al 2013).…”

Section: Literature Reviewmentioning

confidence: 99%

Unknown caller: can we effectively manage the announcement of discovery of extraterrestrial life?

Gartrelle

2015

International Journal of Astrobiology

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The definitive discovery of another form of life from beyond Earth will answer one of our most fundamental questions: Are we alone in the Universe? This announcement will be the most significant in history. It will have impact on every facet of our lives and affect everyone on Earth. Ensuring the announcement is handled properly represents an opportunity to unify government, industrial, and scientific resources to work together on a global scale issue. The purpose of the present paper is to understand whether we have the overall strategy, management structures and process disciplines in place on a global scale to handle an announcement of this magnitude. The research methodology included review and analysis of peer-reviewed work on the topic, publications from appropriate scientific and policy organizations, and public statements from several acknowledged experts in the field of astrobiology and extraterrestrial communications. The 1996 case of the announcement of possible life from Martian meteorite ALH84001 was also analysed. The findings of the paper are multiple deficiencies exist in the ability to manage this problem globally in an integrated fashion across borders, institutional boundaries, and through the media. High-level recommendations are offered to address major identified gaps.

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Planetary geomorphology: Some historical/analytical perspectives

Cited by 13 publications

References 90 publications

Fluvial geomorphology on Earth-like planetary surfaces: A review

Fluvial geomorphology on Earth-like planetary surfaces: A review

Landslide geomorphology evaluation and geology structure analysis at Riau-West Sumatra highway in km 89-94

Unknown caller: can we effectively manage the announcement of discovery of extraterrestrial life?

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