TWIN PLANET

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The term "twin planet" can refer to a few different concepts:
1. Earth's Twin (Venus):

• Venus is often called Earth's twin due to similarities in size, mass, density, and composition. Both planets are rocky and located in the inner solar system.
• However, Venus has a drastically different environment, with a thick, toxic atmosphere of sulfuric acid, extreme surface temperatures hot enough to melt lead (around 900°F or 482°C), and a runaway greenhouse effect.
• Some scientists refer to Venus as Earth's "evil twin," representing a path Earth could have taken but didn't. Studying Venus helps understand the conditions that make a planet habitable.
• Venus has much less water than Earth, even though they're similar in size and mass.

• This refers to a system where two planetary-mass objects orbit a common center of mass located outside of both objects.
• Both objects need to be of comparable mass and size.
• If the objects are smaller, they would be classified as binary asteroids or double dwarf planets, like Pluto and Charon.

• A theoretical planet with conditions similar to Earth.
• It's a planet with an environment where life could have appeared.

• Twin Planet is also the name of a Japanese marketing firm and talent agency.
• Twin Earths is the name of a comic strip
• Twin Earth may refer to a thought experiment by philosopher Hilary Putnam
• Twin and Earth is a type of electricity cable.