Why is Venus called Earth's twin?

Related questions

1. What is my zodiac sign if I was born in October?
2. Who is the bright and morning star in the Bible?
3. What are the 13 constellations?
4. What are October borns called?
5. What does the Bible say about Venus?
6. What do star signs mean?
7. What does Sagittarius mean?
8. What does tropical zodiac mean?

Tags

1. #because
2. #sister
3. #planet
4. #called
5. #sometimes
6. #respects
7. #their
8. #venus
9. #similar
10. #composition
11. #earth
12. #other
13. #terrestrial
14. #proximity
15. #radically
16. #different