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Rotation period at equator: About 27 days.

Rotation period at poles: About 36 days.

Surface temperature: 10,000 degrees Fahrenheit.

Composition: Hydrogen, helium

The Sun The heart of Our Solar System

Mercury The Wild Child of The Sun

Mercury almost completely lacks an atmosphere, which actually contributes to its extreme physical conditions. As the closest planet to the sun, it's no surprise that the planet can get extremely hot. However, the lack of atmosphere means that it is unable to retain the heat and as a result, it exhibits incredible temperature fluctuations.

In addition to barely having an atmosphere, Mercury doesn't have much in the way of axial tilt. Because of this, there are no seasonal changes in weather. It also rotates incredibly slowly, as it only completes about three “days” every two years. When Mercury is closest to the sun, the surface temperature can reach over 430º C (approx. 800ºC ). During nighttime, temperatures can drop down to -180ºC (-290ºF).

If a human were to visit Mercury, he or she would either burst into flames or freeze solid depending on where the spaceship landed.

Venus The Goddess of Love 

Our neighbor Venus is essentially the poster child for how greenhouse gasses can create a completely hellish environment. With a super-thick atmosphere of mostly carbon dioxide, Venus is able to trap more of the sun’s radiation than Mercury, which allows it to reach (and retain) much higher temperatures. The surface temperature stays relatively consistent all year at 480ºC (900º  F). The pressure on Venus is approximately 90 times higher than sea level on Earth. In order to recreate that pressure here, a diver would need to go 1000 meters underwater.Rain on Venus is almost purely sulfuric acid, which is extremely corrosive. Sulfuric acid can erode clothing nearly instantly and produce severe burns on flesh. However, the surface temperature of Venus is so great, the rain evaporates before hitting the ground. There is a little water in the atmosphere, which can produce violent explosions when it meets the sulfuric acid. Though Venus is only slightly smaller than Earth, it takes only four hours for the atmosphere to completely rotate around the planet. In contrast, it it takes about 243 days to accomplish the same task on Earth. 

The Earth Our Mother


Earth's atmosphere is about 300 miles (480 kilometers) thick, but most of it is within 10 miles (16 km) the surface. Air pressure decreases with altitude. At sea level, air pressure is about 14.7 pounds per square inch (1 kilogram per square centimeter). At 10,000 feet (3 km), the air pressure is 10 pounds per square inch (0.7 kg per square cm). There is also less oxygen to breathe.

Mars The Red Planet

Mars is currently under a lot of investigation as some believe it may have harbored life in the past and could give clues to the origin of life on Earth. Because it once was home to flowing water, there must have been an atmosphere capable of holding it there. Now the surface is dry and huge cyclones of dust can tear apart the landscape. 

Mars’ missing atmosphere is a mystery but there is still plenty of bizarre weather happening on the planet. The poles are covered in ice caps and there are intense snowstorms. While our snow is made of frozen water, Martian snow is actually made from frozen carbon dioxide, which we know as “dry ice.”

Like Mercury, Mars’ super-thin atmosphere has a hard time trapping heat from the sun. Temperatures at the equator can be a comfortable 20ºC (70ºF) in the sun, but at night, the same spot can dip to -50ºC (-58ºF).

Massive dust storms can take over Mars quite easily. While dust devils occur in dry areas on Earth, the ones on Mars can envelop the entire planet over the course of a few days. 

As for what it might look like for a human to visit Mars, we might not have to wait too much longer. Some are hoping to send the first astronauts to Mars within the next few decades.

Jupiter The Gaint

It doesn’t take a particularly large telescope to see that Jupiter has a lot of gigantic storms. The most famous of these storms is known as the Great Red Spot (GRS), which has been raging on like a hurricane for at least 400 years. This storm is so massive, three Earths could fit inside it easily. There is another spot known as the Oval BA, which was discovered about seven years ago and is now moving as fast as its larger counterpart. It even appears to be increasing in size!

The stripes on Jupiter are caused by jet streams. Jet streams on Earth vary, though we usually only have 1 or 2 in each hemisphere. Jupiter is home to at least 30 that tear across the planet in opposite directions, reaching speeds of over 482 km/h (300 mph). Two of these jet streams are responsible for holding the GRS in its present location. The clouds that appear as stripes are composed of frozen ammonia, as the temperature at that part of the atmosphere is -140ºC (-220ºF). Earlier this year, it was discovered that Jupiter can form diamonds in its atmosphere

Like Jupiter, Saturn’s atmosphere is composed mostly of hydrogen. Wind speeds can reach as high as 1609 km/h (1000 mph) which is just about as fast as a speeding bullet. The highest wind speed ever recorded on Earth during a hurricane was in 1996, during Tropical Cyclone Cynthia when gusts reached 408 km/h (253 mph). 

At Saturn’s North Pole there is an extremely cool storm going on. It isn’t circular or rounded like most extreme weather systems, but it is actually shaped like a hexagon. The clearest image of this storm can be seen in a composite that was released last month. Each side of the hexagon is 8,600 miles (13,800 km) long, which is very close to the diameter of Earth.

Though the atmosphere is very thin and cold, there is plenty of heat down towards the surface that can generate some extreme storms. In the northern hemisphere, there is a storm which is 10,000 km across. If that were on Earth, it would be like starting in Los Angeles and traveling due east all the way to Beijing, China.

Toward Saturn’s surface the carbon in the air can be pressed into graphite. Yes, Saturn has pencil lead flying around. Even closer to the core, the carbon is pressed into diamonds. If a human were to travel to Saturn, the diamonds would cut through their body like countless little bullets.



One day on Uranus takes about 17 hours (the time it takes for Uranus to rotate or spin once. Uranus makes a complete orbit around the sun (a year in Uranian time) in about 84 Earth years (30,687 Earth days).





Voyager 2 is the only spacecraft to have visited Uranus.

Uranus cannot support life as we know it.



Pluto is about two-thirds the diameter of Earth's moon and probably has a rocky core surrounded by a mantle of water ice. More exotic ices like methane and nitrogen frost coat its surface. Owing to its size and lower density, Pluto's mass is about one-sixth that of Earth's moon. Pluto is more massive than Ceres -- the dwarf planet that resides in the asteroid belt between Mars and Jupiter -- by a factor of 14.

Pluto's 248-year-long elliptical orbit can take it as far as 49.3 astronomical units (AU) from the sun. (One AU is the mean distance between Earth and the sun: about 93 million miles or 150 million kilometers.) From 1979 to 1999, Pluto was actually closer to the sun than Neptune, and in 1989, Pluto came to within 29.8 AU of the sun, providing rare opportunities to study this small, cold, distant world.





The Kuiper Belt and the Oort Cloud are regions of space. The known icy worlds and comets in both regions are much smaller than Earth's moon.

The Kuiper Belt and the Oort Cloud surround our sun, a star. The Kuiper Belt is a doughnut-shaped ring, extending just beyond the orbit of Neptune from about 30 to 55 AU. The Oort Cloud is a spherical shell, occupying space at a distance between five thousand and 100 thousand AU.

Long-period comets (which take more than 200 years to orbit the sun) come from the Oort Cloud. Short-period comets (which take less than 200 years to orbit the Sun) originate in the Kuiper Belt.


Some dwarf planets within the Kuiper Belt have thin atmospheres that collapse when their orbit carries them farthest from the sun.

The Kuiper Belt and the Oort Cloud are regions of space and therefore do not have moons. However, several dwarf planets within the Kuiper Belt have moons.

The Kuiper Belt and the Oort Cloud are regions of space and therefore do not have rings. No objects within these two regions are known to have rings.

The first mission to the Kuiper Belt is New Horizons. New Horizons will reach Pluto in 2015.

These two regions of space are not capable of supporting life as we know it.

Fact: Both the Kuiper Belt and the Oort Cloud are named for the astronomers who predicted their existence during the 1950s: Gerard Kuiper and Jan Oort.


Distance from the Sun: About 1.8 billion miles, about 19 times further than the Earth.

Year: About 84 Earth years.

Voyager 2 flew past Uranus in 1986, giving us our first close view of the planet. It is still functioning today as it flies in deep space, more than 10 billion miles from Earth. Voyager 2 and its companion spacecraft, Voyager 1, are returning data on how the influence of our sun wanes as they get further from it, and on the characteristics of space between the stars.