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What is Earth's twin planet?

Published in Planetary Science 2 mins read

Venus is often called Earth's twin planet because they are quite similar in size.

Venus: Earth's Close Sibling

Venus is frequently referred to as Earth's twin due to several striking similarities. Here's a look at why they share this designation:

  • Size Similarity: As stated in the reference, Venus is almost as big as Earth. This makes them the most similar in size among all the planets in our solar system.
  • Formation: Both planets formed in the same inner part of the solar system. This shared origin also contributes to the twin planet nickname.

Key Differences

Despite the similarities, Venus and Earth are vastly different worlds. Venus has a thick, toxic atmosphere that creates a runaway greenhouse effect and a surface hot enough to melt lead. In contrast, Earth has a breathable atmosphere and supports diverse life.

Table of Comparison

Feature Earth Venus
Size Slightly larger Slightly smaller, almost Earth size
Atmosphere Nitrogen and oxygen rich Thick, carbon dioxide-rich
Temperature Moderate, average 15°C Extremely hot, average 464°C
Habitability Supports diverse life Inhospitable for life as we know it
Origin Inner solar system Inner solar system


While Venus and Earth are twins in the sense that they have similar sizes and origins, they are very different planets.

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