VENUS---CH.9

WHAT is the surface features of Venus like?

- Ishtar Terra and Aphrodite Terra - Surface is relatively smooth - No plate tectonics - Mountains, a few craters, volcanoes

WHY is Venus called Earth's twin?

- b/c it's similar in size

Large amount of ____________ ______________ in atmosphere, and closeness to ___________, led to runaway greenhouse effect and very hot surface

- carbon dioxide - sun

WHAT is the atmosphere of Venus like?

- very dense - higher pressure than Earth's - 90x more massive than Earth's *•Earth - 90% of atmosphere lies within 10 km •Venus - 90% of atmosphere lies within 50 km*

WHAT is Venus sometimes called?

-Earth's sister planet -Called morning or evening star, as it is still "tied" to Sun.

Atmosphere very __________, mostly composed of ___________ ______________.

-dense -carbon dioxide

HOW MANY moons does Venus have?

0

VENUS is the dullest/brightest object in the sky, after Sun and Moon?

BRIGHTEST

WHY is Venus the brightest planet?

Brightest planet due to albedo and close distance to us (largest angular diameter).

WHAT is the atmospheric composition of Venus like?

Carbon dioxide 96.5% Nitrogen 3.5% Trace of sulfur dioxide, water vapor, and carbon monoxide

_______________ atmosphere and ________________ clouds make surface impossible to see in visible light and make the planet the hottest in the solar system.

DENSE ATMOSPHERE AND THICK CLOUDS

Venus resembles a young ____________ (1 billion years)—no asthenosphere, thin crust

EARTH

Volcanoes active in the past, but are they active today?

Evidence of volcanic activity: •Fluctuations in sulfur dioxide in atmosphere •Bursts of radio energy from regions around volcanoes (lighting near erupting plumes)

VENUS

Goddess of love and beauty

VENUS IS THE coldest/hottest of all the planets?

HOTTEST

WHAT are the 2 continental features of Venus?

Ishtar Terra and Aphrodite Terra

Many ____________ ______________ and shield volcanoes

LAVA DOMES

APHRODITE TERRA

Largest highlands on Venus

ISHTAR TERRA

Located on the North Pole of Venus, size of Australia or the U.S.

Venus is comparable to Earth in....

MASS AND RADIUS

_____________ and ________________ are just slightly smaller than Earth

MASS AND RADIUS

IS there evidence of plate tectonics on Venus?

NO

WHAT is the interior of Venus like?

Probably has similar core to Earth

DOES VENUS have the highest Albedo out of all the planets?

YES

DOES VENUS have the largest Angular diameter out of all the planets?

YES 64"

VENUS'S axial tilt is....

almost upside down

LAVA DOMES

bulbous mass of congealed lava; associated with explosive eruptions

Surface of Venus is hidden by......

cloud cover

Apparent brightness of Venus *varies*, due to ......

due to changes in phase and distance from Earth.

Upper atmosphere of Venus has ___________ ____________, but atmosphere near surface is almost calm

high winds

WHAT are the volcanoes on Venus like?

most are shield volcanoes (not associated with plate boundaries)

Does Venus have a magnetic field?

no, because of its slow rotation

Venus's atmosphere is the victim of a.....

runaway greenhouse effect—just kept getting hotter and hotter as infrared radiation is reabsorbed

WHAT is there a lot of in Venus's atmosphere?

sulfuric acid clouds and haze

WHAT IS VENUS'S rotation period like?

• -243 days (negative means retrograde) *•Slow, retrograde rotation of Venus results in large difference between solar day (117 Earth days) and sidereal day (243 Earth days); both are large compared to the Venus year (225 Earth days)*

Venus is never too far from the _________ and is the brightest object in the sky (after the Sun and Moon)

SUN