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Venus:

At first glance, if Earth had a twin, it would be Venus. The two planets are similar in size, mass, composition, and distance from the Sun. But there the similarities end. Venus has no ocean. Venus is covered by thick, rapidly spinning clouds that trap surface heat, creating a scorched greenhouse like world with temperatures hot enough to melt lead and pressure so intense that standing on Venus would feel like the pressure felt 900 meters deep in Earth's oceans.

These clouds reflect sunlight in addition to trapping heat. Because Venus reflects so much sunlight, it is usually the brightest planet in the sky.

The atmosphere consists mainly of carbon dioxide (the same gas that produces fizzy sodas), droplets of sulfuric acid, and virtually no water vapor - not a great place for people or plants! In addition, the thick atmosphere allows the Sun's heat in but does not allow it to escape, resulting in surface temperatures over 450 C, hotter than the surface of the planet Mercury, which is closest to the Sun. The high density of the atmosphere results in a surface pressure 90 times that of Earth, which is why probes that have landed on Venus have only survived several hours before being crushed by the incredible pressure. In the upper layers, the clouds move faster than hurricane- force winds on Earth.

Venus sluggishly rotates on its axis once every 243 Earth days, while it orbits the Sun every 225 days - its day is longer than its year! Besides that, Venus rotates retrograde, or "backwards," spinning in the opposite direction of its orbit around the Sun. From its surface, the Sun would seem to rise in the west and set in the east.

Earth and Venus are similar in density and chemical compositions, and both have relatively young surfaces, with Venus appearing to have been completely resurfaced 300 to 500 million years ago.

Scientists used radar to peer through the clouds and map the surface of Venus.

The surface of Venus is covered by about 20 percent lowland plains, 70 percent rolling uplands, and 10 percent highlands. Volcanism, impacts, and deformation of the crust have shaped the surface. No direct evidence of currently active volcanoes has been found, although large variations of sulfur dioxide in the atmosphere lead some scientists to suspect that volcanoes may be active.

Although no rainfall, oceans, or strong winds exist to erode surface features, some weathering and erosion does occur. The surface is brushed by gentle winds, no stronger than a few kilometers per hour, enough to move grains of sand, and radar images of the surface show wind streaks and sand dunes. In addition, the corrosive atmosphere probably chemically alters rocks. Impact cratering is also affected by the dense atmosphere: craters smaller than 1.5 to 2 km across do not exist on Venus, largely because small meteors burn up in Venus dense atmosphere before they can reach the surface.

More than 1,000 volcanoes or volcanic centers larger than 20 km in diameter dot the surface of Venus. There may be close to a million volcanic centers that are over 1 km in diameter. Much of the surface is covered by vast lava flows. In the north, an elevated region named Ishtar Terra is a lava-filled basin larger than the continental United States. Near the equator, the Aphrodite Terra highlands, more than half the size of Africa, extend for almost 10,000 km. Volcanic flows have also produced long, sinuous channels extending for hundreds of kilometers.

With few exceptions, features on Venus are named for accomplished women from all of Earth's cultures.

Venus' interior is probably very similar to that of Earth, containing an iron core about 3,000 km in radius and a molten rocky mantle covering the majority of the planet. Recent results from the Magellan spacecraft suggest that Venus' crust is stronger and thicker than had previously been thought. Venus has no satellites and no intrinsic magnetic field, but the solar wind rushing by Venus creates a pseudo-field around the planet

Venus: Facts & Figures

Discovered By: Known by the Ancients

Date of Discovery: Unknown

 

Average Distance from the Sun

Metric: 108,208,930 km

English: 67,237,910 miles

Scientific Notation: 1.0820893 x 108 km (.723332 A.U.)

By Comparison: 0.723 x Earth

 

Perihelion (closest)

Metric: 107,476,000 km

English: 66,782,000 miles

Scientific Notation: 1.07476 x 108 km (0.718 A.U.)

By Comparison: 0.730 x Earth

 

Aphelion (farthest)

Metric: 108,942,000 km

English: 67,693,000 miles

Scientific Notation: 1.08942 x 108 km (0.728 A.U.)

By Comparison: 0.716 x Earth

 

Equatorial Radius

Metric: 6,051.8 km

English: 3,760.4 miles

Scientific Notation: 6.0518 x 103 km

By Comparison: 0.9488 x Earth

 

Equatorial Circumference

Metric: 38,025 km

English: 23,627 miles

Scientific Notation: 3.8025 x 104 km

 

Volume

Metric: 928,400,000,000 km3

Scientific Notation: 9.284 x 1011 km3

By Comparison: 0.88 x Earth's

 

Mass

Metric: 4,868,500,000,000,000,000,000,000 kg

Scientific Notation: 4.8685 x 1024 kg

By Comparison: 0.815 x Earth

 

Density

Metric: 5.24 g/cm3

By Comparison: Comparable to the average density of the Earth.

 

Surface Area

Metric: 460,200,000 km2

English: 177,700,000 square miles

Scientific Notation: 4.602 x 108 km2

By Comparison: 0.902 x Earth

 

Equatorial Surface Gravity

Metric: 8.87 m/s2

English: 29.1 ft/s2

By Comparison: If you weigh 100 pounds on Earth, you would weigh

91 pounds on Venus.

 

Escape Velocity

Metric: 37,300 km/h

English: 23,200 mph

Scientific Notation: 1.036 x 104 m/s

By Comparison: 0.927 x Earth

 

Sidereal Rotation Period (Length of Day)

-243 Earth days (retrograde)

-5832 hours (retrograde)

By Comparison: 244 x Earth

 

Sidereal Orbit Period (Length of Year)

0.615 Earth years

224.7 Earth days

By Comparison: 0.615 x Earth

 

Mean Orbit Velocity

Metric: 126,077 km/h

English: 78,341 mph

Scientific Notation: 35,021.4 m/s

By Comparison: 1.176 x Earth

 

Orbital Eccentricity

.0068

By Comparison: 0.405 x Earth

 

Orbital Inclination to Ecliptic

3.39 degrees

Equatorial Inclination to Orbit

177.3 degrees

By Comparison: 7.56 x Earth

 

Orbital Circumference

Metric: 675,300,000 km

English: 419,600,000 miles

Scientific Notation: 6.753 x 108 km

By Comparison: 0.731 x Earth

 

Minimum/Maximum Surface Temperature

Metric: 462 C

English: 864 F

Scientific Notation: 735 K

Atmospheric Constituents

Carbon Dioxide, Nitrogen

Scientific Notation: CO2, N2

By Comparison: Earth's atmosphere consists mostly of N2 and O2.

 

CO2 is largely responsible for the Greenhouse Effect and is used for

carbonation in beverages.

N2 is 80% of Earth's air and is a crucial element in DNA.

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