Obviously Venus as it is shaped like earth that s why it is known as earths twin

Earth's Twin: Venus

Introduction:
The planet known as the "Earth's Twin" is Venus. Venus has often been referred to as Earth's twin due to several similarities it shares with our planet. In this response, we will explore these similarities and delve into the reasons behind Venus being considered Earth's twin.

Atmosphere:
One of the primary reasons Venus is considered Earth's twin is its atmosphere. Both Venus and Earth have atmospheres primarily composed of nitrogen, with traces of other gases. However, Venus has a much denser atmosphere compared to Earth, consisting mainly of carbon dioxide. This dense atmosphere results in a greenhouse effect, leading to a surface temperature on Venus that is hotter than Mercury, despite being farther from the Sun.

Size and Gravity:
Venus is similar in size to Earth, making it another factor contributing to its "twin" status. With a diameter of about 12,104 kilometers, Venus is only slightly smaller than Earth. Additionally, Venus has a gravity that is approximately 91% of Earth's gravity, further enhancing its resemblance to our planet.

Orbit and Rotation:
Venus also shares similarities with Earth in terms of its orbit and rotation. Both planets have an almost circular orbit around the Sun, with Venus taking approximately 225 Earth days to complete one orbit. Furthermore, Venus rotates on its axis in a retrograde direction, meaning its rotation is opposite to the direction of its orbit, similar to Earth.

Temperature and Geology:
Although Venus has a scorching surface temperature due to its thick atmosphere, its geology exhibits some similarities to Earth. Both planets have mountains, valleys, and volcanoes. Venus, in fact, has numerous volcanoes, including the massive Maxwell Montes, which is the highest peak on the planet. The presence of geological features akin to Earth further strengthens the notion of Venus being Earth's twin.

Conclusion:
In conclusion, Venus is rightfully known as Earth's twin due to the similarities it shares with our planet. From its atmosphere and size to its orbit and rotation, Venus closely resembles Earth in many aspects. While Venus may not be habitable like Earth, studying its characteristics can provide valuable insights into the formation and evolution of planets, including our own.