Venus
Venus is the second planet from the Sun and is Earth’s closest planetary neighbor.
These are not identical twins, however – there are radical differences between the two worlds.
Venus has a thick, toxic atmosphere filled with carbon dioxide and it’s perpetually shrouded in thick, yellowish clouds of sulfuric acid that trap heat, causing a runaway greenhouse effect. It’s the hottest planet in our solar system, even though Mercury is closer to the Sun. Surface temperatures on Venus are about 900 degrees Fahrenheit (475 degrees Celsius) – hot enough to melt lead. The surface is a rusty color and it’s peppered with intensely crunched mountains and thousands of large volcanoes. Scientists think it’s possible some volcanoes are still active.
Venus has crushing air pressure at its surface – more than 90 times that of Earth – similar to the pressure you'd encounter a mile below the ocean on Earth.
Another big difference from Earth – Venus rotates on its axis backward, compared to most of the other planets in the solar system. This means that, on Venus, the Sun rises in the west and sets in the east, opposite to what we experience on Earth. (It’s not the only planet in our solar system with such an oddball rotation – Uranus spins on its side.)
Venus was the first planet to be explored by a spacecraft – NASA’s Mariner 2 successfully flew by and scanned the cloud-covered world on Dec. 14, 1962. Since then, numerous spacecraft from the U.S. and other space agencies have explored Venus, including NASA’s Magellan, which mapped the planet's surface with radar. Soviet spacecraft made the most successful landings on the surface of Venus to date, but they didn’t survive long due to the extreme heat and crushing pressure. An American probe, one of NASA's Pioneer Venus Multiprobes, survived for about an hour after impacting the surface in 1978.
More recent Venus missions include ESA’s Venus Express (which orbited from 2006 until 2016) and Japan’s Akatsuki Venus Climate Orbiter (orbiting since 2016).
NASA’s Parker Solar Probe has made multiple flybys of Venus. On Feb. 9, 2022, NASA announced the spacecraft had captured its first visible light images of the surface of Venus from space during its February 2021 flyby.
The information published here was produced by NASA.
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10 Need-to-Know Things about Venus
#1 - Toxic Twin
Venus is often called "Earth’s twin" because they’re similar in size and structure, but Venus has extreme surface heat and a dense, toxic atmosphere. If the Sun were as tall as a typical front door, Earth and Venus would each be about the size of a nickel.
#2 - Second Rock
Venus is the second closest planet to the Sun, orbiting at a distance of about 67 million miles (108 million kilometers)
#3 - Long Days, Short Years
Venus rotates very slowly on its axis – one day on Venus lasts 243 Earth days. The planet orbits the Sun faster than Earth, however, so one year on Venus takes only about 225 Earth days, making a Venusian day longer than its year!
#4 - Diverse Terrain
Venus has a solid surface covered in dome-like volcanoes, rifts, and mountains, with expansive volcanic plains and vast, ridged plateaus.
#5 - Youthful Surface
The average surface of Venus is less than a billion years old, and possibly as young as 150 million years old – which is relatively young from a geological perspective. This is a major conundrum for scientists – they don’t know exactly what happened that made Venus completely resurface itself.
#6 - Runaway Greenhouse
Venus’ thick atmosphere traps heat creating a runaway greenhouse effect – making it the hottest planet in our solar system with surface temperatures hot enough to melt lead. The greenhouse effect makes Venus roughly 700°F (390°C) hotter than it would be without a greenhouse effect.
#7 - Stinky Clouds
Venus is permanently shrouded in thick, toxic clouds of sulfuric acid that start at an altitude of 28 to 43 miles (45 to 70 kilometers). The clouds smell like rotten eggs!
#8 - Spacecraft Magnet
Venus was the first planet explored by a spacecraft and was intensely studied early in the history of space exploration. Venus was also the first planet whose surface was reached by a spacecraft from Earth. The intense heat means landers have only survived for a couple of hours.
#9 - Life on Venus
Venus is an unlikely place for life as we know it, but some scientists theorize microbes might exist high in the clouds where it’s cooler and the pressure is similar to Earth’s surface. Phosphine, a possible indicator of microbial life, has been observed in the clouds.
#10 - Backward Sunrise
Venus rotates backward on its axis compared to most planets in our solar system. This means the Sun rises in the west and sets in the east, opposite of what we see on Earth
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