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Venus, Earth’s twin sister

Venus has long been considered Earth’s twin sister. The two planets are very similar in some respects and share many physical and orbital characteristics:

  • They were born at about the same time in the same cloud of gas and dust, 4.6 billion years ago
  • Venus and the Earth are both inner planets
  • Their surfaces show varying terrains : mountains, plains, high plateux, gorges, volcanoes, crests and impact craters
  • They both have few craters, implying a relatively young surface
  • They have atmospheres with dense clouds
  • Their chemical compositions are very close
  • Venus is the closest neighbouring planet

Because of these similarities, we had long thought that below the dense clouds, Venus could be like the Earth and could maybe even harbour life. But Venus is very different from the Earth in many respects.

Comparison between the Earth and Venus

Venus

Earth

Ratio (Venus/Earth)

4.8685

5.9736

0.815

92.843

108.321

0.857

6051.8

6378.1

0.949

6051.8

6356.8

0.952

6051.8

6371.0

0.950

0.000

0.00335

0.0

5243

5515

0.951

8.87

9.80

0.905

8.87

9.78

0.907

10.36

11.19

0.926

0.3249

0.3986

0.815

0.750

0.306

2.45

0.65

0.367

1.77

-4.40

-3.86

-

2613.9

1367.6

1.911

231.7

254.3

0.911

15

20

0.750

0.33

0.3308

0.998

4.458

1082.63

0.004

0

1

 

No

No

 

92

1.013

 

737 K
(464 C)

 

 

96.5% CO2
3.5% N2

77% N2
21% O2

 

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