Астрономический вестник, Год журнала: 2023, Номер 57(5), С. 403 - 414
Опубликована: Сен. 1, 2023
Язык: Английский
Space Science Reviews, Год журнала: 2024, Номер 220(4)
Опубликована: Апрель 29, 2024
Abstract Surface geologic features form a detailed record of Venus’ evolution. Venus displays profusion volcanic and tectonics features, including both familiar exotic forms. One challenge to assessing the role these in evolution is that there are too few impact craters permit age dates for specific or regions. Similarly, without surface water, erosion limited cannot be used evaluate age. These same observations indicate has, on average, very young (150–1000 Ma), with most recent deformation volcanism largely preserved except where covered by ejecta. In contrast, activity Mars, Moon, Mercury occurred 1st billion years. Earth’s processes almost all result plate tectonics. lacks such network connected, large scale plates, leaving nature dominant geodynamic process up debate. this review article, we describe key tectonic models their origin, possible links We also present current knowledge composition thickness crust, lithospheric thickness, heat flow given critical shaping geology interior Given hot lithosphere, abundant potential analogues continents, roll-back subduction, microplates, it may provide insights into early Earth, prior onset true explore similarities differences between Proterozoic Archean Earth. Finally, future measurements needed advance our understanding volcanism, tectonism, Venus.
Язык: Английский
Процитировано
8
Space Science Reviews, Год журнала: 2023, Номер 219(7)
Опубликована: Окт. 1, 2023
Abstract In this work we discuss various selected mission concepts addressing Venus evolution through time. More specifically, address investigations and payload instrument supporting scientific goals open questions presented in the companion articles of volume. Also included are their related (observations & modeling) discussion which measurements future data products needed to better constrain Venus’ atmosphere, climate, surface, interior habitability A new fleet missions has been selected, will continue be considered for selections. Missions under development include radar-equipped ESA-led EnVision M5 orbiter (European Space Agency 2021), NASA-JPL’s VERITAS (Smrekar et al. 2022a), NASA-GSFC’s DAVINCI entry probe/flyby (Garvin 2022a). The acquired with VERITAS, DAVINCI, from end decade fundamentally improve our understanding planet’s long term history, current activity evolutionary path. We further describe beyond framework missions, as well synergies between these concepts, ground-based space-based observatories facilities, laboratory measurements, algorithmic or modeling activities that pave way a program extends into 2040s (Wilson 2022).
Язык: Английский
Процитировано
21
Space Science Reviews, Год журнала: 2023, Номер 219(1)
Опубликована: Фев. 1, 2023
In this chapter we examine how our knowledge of present day Venus can inform terrestrial exoplanetary science and study Venus. a superficial way the contrasts in appear stark. We have been looking at for millennia studying it via telescopic observations centuries. Spacecraft began with Mariner 2 1962 when confirmed that was hothouse planet, rather than tropical paradise fiction pictured. As long as level exploration understanding remains far below Mars, major questions will endure. On other hand, has grown leaps bounds since discovery Pegasus 51b 1995, not too after golden years spacecraft missions came to an end Magellan Mission 1994. Multi-million billion dollar/euro exoplanet focused such JWST, its successors be flown coming decades. At same time, excitement about is blooming again number proposed decades from India, Russia, Japan, European Space Agency National Aeronautics Administration. chapter, review what known may discover tomorrow complementary studies cousins.
Язык: Английский
Процитировано
16
Nature Astronomy, Год журнала: 2024, Номер 8(4), С. 417 - 424
Опубликована: Апрель 22, 2024
Язык: Английский
Процитировано
4
Physics of The Earth and Planetary Interiors, Год журнала: 2025, Номер unknown, С. 107332 - 107332
Опубликована: Фев. 1, 2025
Язык: Английский
Процитировано
0
Journal of Geophysical Research Planets, Год журнала: 2025, Номер 130(3)
Опубликована: Март 1, 2025
Abstract The Baltis Vallis channel on Venus preserves a record of long‐wavelength deformation generated by convecting mantle, providing unique window into the planet's geodynamics. Notably, observed topography along is not downhill, suggesting complex interactions between surface processes and mantle dynamics. We statistically compare dynamic with topographies suite stagnant‐lid convection models to constrain Venus' interior Vallis's relatively young age (likely 250 Myr) low root‐mean‐square relief 217 m indicate vigorous in Venus's Rayleigh number 4 , implying viscosity 1–2 orders magnitude lower than Earth's. This difference may result from either water‐rich, less‐degassed or higher‐temperature beneath an insulating lid. Additionally, our simulations suggest that melt advection dominate heat transport Venus, potentially leading non‐linear temperature profiles crust. Upcoming missions such as VERITAS EnVision will deliver higher‐resolution gravity topographic data, further constraints present‐day internal dynamics origin Vallis.
Язык: Английский
Процитировано
0
Journal of Geophysical Research Planets, Год журнала: 2023, Номер 128(9)
Опубликована: Авг. 26, 2023
Abstract Lightning in the atmosphere of Venus is either ubiquitous, rare, or non‐existent, depending on how one interprets diverse observations. Quantifying when and where, even if lightning occurs, would provide novel information about Venus' atmospheric dynamics chemistry. also a potential risk to future missions, which could float cloud layers (∼50–70 km above surface) for up an Earth‐year. Over decades, spacecraft ground‐based telescopes have searched at using many instruments, including magnetometers, radios, optical cameras. Two surveys (from Akatsuki orbiter 61‐inch telescope Mt. Bigelow, Arizona) observed several flashes 777 nm (the unresolved triplet emission lines excited atomic oxygen) that been attributed lightning. This conclusion based, part, statistical unlikelihood so meteors producing such energetic flashes, based turn presumption low fraction (<1%) meteor's energy emitted nm. We use observations terrestrial analogue experiments show much higher conversion factor (∼5%–10%) should be expected. Therefore, we calculate smaller, more numerous meteoroids caused flashes. likely too rare pose hazard missions pass through dwell clouds Venus. Likewise, small burn altitudes ∼100 km, roughly twice as high surface clouds, not hazard.
Язык: Английский
Процитировано
8
Solar System Research, Год журнала: 2023, Номер 57(5), С. 414 - 425
Опубликована: Окт. 1, 2023
Abstract — Models of the internal structure Venus have been constructed with a wide range crustal thickness (30–70 km) and core radius (2800–3500 km). An analysis pressure values in center planet allows us to conclude that presence solid inner is unlikely if composition temperature profile correspond Earth. Andrade’s rheology was used take into account inelasticity interior when calculating tidal Love numbers angle delay hump. Comparison experimental number k 2 model gives 3100–3500 km. It shown determine characteristic viscosity Venusian mantle, key factor determination retardation bulge: 0.9° low high temperature, 0.4° so planned measurements parameters moment inertia VERITAS EnVision missions will be able impose restrictions on distribution Venus.
Язык: Английский
Процитировано
8
Journal of Geophysical Research Planets, Год журнала: 2023, Номер 128(11)
Опубликована: Окт. 27, 2023
Abstract Venus is the only other Earth‐sized planet in Solar System but it does not exhibit evidence of plate tectonics that dominates geological processes on Earth. Surface deformation mainly driven by mantle convection and plume‐lithosphere interactions, likely represented widespread development circular volcano‐tectonic features known as coronae. Here, we present a joint study mission data analysis 3D modeling asymmetric coronae Venus. We systematically analyze 155 largest terms surface topography morphology. establish 75% those are radially asymmetric, further sub‐categorize them based their adjacent topography. This reveals many positioned at topographic transition between lowland plateau (termed margin). With state‐of‐the‐art numerical models, investigate physical behind plume‐margin interactions find several tectonic styles may be responsible for margins, including lowland‐sided subduction, plateau‐sided lithospheric dripping, an embedded plume. The gradient strength across margin controls these styles, larger gradients enhance resurfacing lifetime also density increase associated with basalt‐to‐eclogite phase change provides extra negative gravitational force required downgoing crust to recycled into mantle. models presented this reproduce wide set asymmetrical corona found suggest they generally more long‐lived than symmetric
Язык: Английский
Процитировано
7
Space Science & Technology, Год журнала: 2023, Номер 4
Опубликована: Дек. 18, 2023
No matter how fascinating and exotic other terrestrial planets are revealed to be, nothing generates more excitement than announcements regarding their habitability. From the observation of Mars present-day efforts toward Venus characterization exoplanets, search for life, or at least environments that could accommodate has been a major drive space exploration. So far, we have found no unquestionably habitable world besides Earth. The conditions habitability proved elusive, as surface depend on complex interplay many processes throughout evolution planet. Here, review interior rocky planet can its atmosphere. Instead listing criteria assumed be critical discuss bulk-silicate affect onset, continuation, cessation We then consider it observed, current this end.
Язык: Английский
Процитировано
7