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You may be referring to Venus, the 2nd planet which is nearly the same mass and size as Earth.

Since Venus is closer to the Sun than Earth is, Venus orbits more quickly that the Earth does. As Venus passes the Earth, Venus becomes the morning star; then when Venus passes behind the Sun and starts to catch up again, Venus sets after the Sun, becoming the evening star.

Venus is in many ways Earth's sister; they're similar in size, and therefore in surface gravity; they both have substantial atmospheres; and Venus is Earth's closest planetary neighbor after the moon.

But Venus is definitely the nasty sister: its atmosphere is made up primarily of carbon dioxide (97%) and sulfuric acid; its surface temperature averages 900° F (485° C), hotter than the surface of Mercury; and the atmospheric pressure at its surface is 90 times that of Earth.

It's such an inhospitable place that the world record for a surface lander remaining operational is less than an hour, as opposed to Mars exploration rovers, some of which are still operational after more than five years.

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14y ago

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