The Earth is 93 million miles from the sun. Thus, the discovery of an Earth-mass world orbiting the star is significant. The closest planet to the Earth should be either the previous planet (Venus), or the following (Mars) Look up the mean radii of these planets orbits To find the average distance between Earth & Mars and Earth & Venus, subtract the smaller radius from the bigger one for each pair Mercury (above) is the closest planet to Earth — in fact, it’s the closest planet to every other planet. While Venus is an average of 25 million miles away from Earth, Mars is an average of 140 million miles away. This fact constantly changes due to the range in the orbits of the planets located in our solar system. It is both the Earth’s closest neighbor in our Solar System and the planet most similar to Earth in size, gravity, and composition. Because of where the planets are on these orbital paths, and specifically the time it takes Mercury to orbit the sun, Mercury is the planet that is closest to Earth more often and has an average distance to Earth that is lower than the other 2 inner planets. Hopes of finding life on our nearest Earth-like planet have been dashed after scientists revealed it is being bombarded with radiation. Earth and Venus share a lot in common; they are both terrestrial planets and they both orbit the sun’s habitable zone. It is approximately 4.2 light-years (4.0 × 10 13 km) from Earth in the constellation Centaurus, making it and Proxima c the closest known exoplanets to the Solar System. Proxima Centauri b (also called Proxima b or Alpha Centauri Cb) is an exoplanet orbiting in the habitable zone of the red dwarf star Proxima Centauri, which is the closest star to the Sun and part of a triple star system. This means that Venus is Earth's closest neighbor. This depends on the day, month, and even year, which determines the position in orbit the planets are in. As a result, its planets are thought to be the closest comfortable locations for any possible alien life. After the Moon, Venus is the brightest natural object in the night sky. Planet b, which is the closest to its host star, completes on quick orbit of the star every 11 Earth days. Venus is extremely hot because of its carbon-dioxide rich atmosphere and has been ruled out as a candidate for life. NASA: This planet is the closest thing to Earth yet If future generations did make it to Wolf 1061c, they'd find an oversize rocky planet circling a star that's dimmer and smaller than our sun. We can’t see the surface of Venus from Earth, because it is covered with thick clouds. The nearest planet to Earth is Venus, which orbits at a distance of 67 million miles and sometimes passes within 26 million miles of Earth. 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