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NOTES: Venus 0.95 DEarth Surface Temp. = 900 OF, Greenhouse effect. Atm. Pressure = 90 x Earth's - PowerPoint PPT Presentation


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NOTES: Venus 0.95 DEarth Surface Temp. = 900 OF, Greenhouse effect. Atm. Pressure = 90 x Earth's Atmosphere : 96% CO2, 3.5% Nitrogen. Clouds of sulfuric acid, sulfur dioxide, sulfur, indicating live volcanism? 2. Rotation : siderial--243 days, solar–117 days.

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  • NOTES: Venus

  • 0.95 DEarth

  • Surface Temp. = 900 OF, Greenhouse effect.

  • Atm. Pressure = 90 x Earth's

  • Atmosphere: 96% CO2, 3.5% Nitrogen. Clouds of sulfuric acid, sulfur dioxide,

  • sulfur, indicating live volcanism?

  • 2. Rotation: siderial--243 days, solar–117 days.

  • 3. Surface Features: 27% Lowlands, 65% rolling plains, 8% highlands.

  • Cones, faults, craters, multiple lava flows.

  • A. Ishtar Terra--US sized lava-filled basin--highlands

  • B. Maxwell Montez--Everest's height--100 km Diam.

  • Cleopatra, crater on it's flank.

  • C. White magnetite (?) above 2.5 km.

  • D. Surface--young to 800 million years--crater cycle.

  • E. Surface too cracked to form plates, but molten core

  • distorts surface with mantle convective flow.

  • F. Atmosphere rotates much faster than surface

  • creating wind features--impact ejected to west, streaks near ridges.

  • G. 100,000 small 'shield' volcanos--clusters due to hot spots,

  • volcanic material near surface. No plumes show--high pressure.

  • H. Lava Channels--one 7,000 (!) Km long

  • I. Calderas over 100 km in diameter.

  • 4. Visiting Spacecraft: 1962-1975-Three Mariners (USA) rudimentary mapping.

  • 1962--Venera--Soviet surface landing.

  • 1989-90--Magellan (USA)--accurate radar maps.




Venus

0.95 Diamearth

Surface Temp. = 900 OF, Greenhouse effect.

Atm. Pressure = 90 x Earth's

In UV

Radar map


Atmosphere: 96% CO2, 3.5% Nitrogen. Clouds of sulfuric acid, sulfur dioxide,

sulfur, indicating live volcanism?


Rotation: sidereal day--243 Earth days, solar day–117 days.


3. Surface Features: 27% Lowlands, 65% rolling plains,

8% highlands. No oceans—way too hot!

Cones, faults, craters, multiple lava flows.

A. Ishtar Terra--US sized lava-filled basin—highlands— lower right.

B. Aphrodite—reflective volcanic cones--top.


Carl Sagan realized Venus was warmed

by what he called a ‘greenhouse effect’—

almost all carbon dioxide atmosphere  very hot.


B. Maxwell Montez--Everest's height--100 km Diam.

Cleopatra, crater on it's flank


Reflective magnetite on volcanic peaks above 2.5 km.


Surface--young to 800 million years--crater cycle.

Every few million years, Venus may blow her top.


Atmosphere rotates much faster than surface

creating wind features--impact ejected to west, streaks near ridges.


100,000 small 'shield' volcanos--clusters due to hot spots, volcanic material near surface. No plumes show

--high pressure


Lava Channels--one 7,000 (!) km volcanic material near surface. No plumes show

Calderas over 100 km in diameter.


Visiting Spacecraft volcanic material near surface. No plumes show: 1962--Venera--Soviet surface landing.

1962-1975-Three Mariners (USA) rudimentary mapping.

2005now—Venus Express (Europe).


1989-90--Magellan (USA)--accurate radar maps. volcanic material near surface. No plumes show


Venus Express—2005-now. volcanic material near surface. No plumes show

Orbiter put up by European Space Agency (ESA).

Attempt to learn details of Venus’ atmosphere and movement,

unveil current volcanism and cause of super-rotation – the

'mismatch' in rotation speeds between the cloud tops

and the planet surface.


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