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Do All Planets Orbit the Sun?

Do all planets orbit the sun? That’s a question that has long puzzled astronomers. After all, the Earth, Jupiter, and Saturn all orbit the Sun in a roughly circular plane. However, some of these planets’ orbits do not fit perfectly into that plane. The most extreme example is Pluto’s orbit, which veers 17 degrees from the ecliptic. Regardless, this is not a problem that we need to solve right away.


Exoplanets orbit the sun in a tight, elliptical pattern, blocking more light than their star. Among the planets found orbiting the sun are super-Earths (rocky worlds larger than Earth), mini-Neptunes (worlds slightly smaller than Uranus and Neptune), and dwarf planets. The first exoplanet discovered in a system is designated “b,” while later ones are assigned subsequent letters.

The next generation of space telescopes is launching soon to aid the hunt for exoplanets that may harbor life. The James Webb Space Telescope will launch in 2021 and will be the largest space telescope to date. It will be able to observe 1,000 exoplanets and measure their atmospheres. But we’ll have to wait a bit longer for that. As of now, we only know about a handful of exoplanets.

Finding exoplanets is not an easy task. Most have been discovered indirectly using indirect imaging techniques. Astronomers monitor the brightness of stars to determine whether an exoplanet is passing nearby. The star may dim suddenly. It may also wobble, indicating that a planet is tugging on its star’s gravity. But how many exoplanets have been detected so far?

There are currently four confirmed exoplanets orbiting the sun. These planets orbit a star 200 light-years from Earth. The diversity of these planets makes them ideal targets for atmospheric characterization using NASA’s upcoming James Webb Space Telescope. If they’re found in the next few decades, astronomers will be able to study their surroundings in detail. However, there is a significant scientific obstacle: observing the planets from Earth.

Earth’s orbit

Water is found in large quantities throughout the Solar System. In fact, there is large amounts of water everywhere on Earth’s surface. Earth is the only astronomical body known to harbor life. While large bodies of water can be found on other bodies, the ocean covers about 71% of the Earth’s surface, dwarfing lakes, rivers, and polar ice. In fact, there are no other planets in the Solar System that can sustain liquid surface water.

The Earth’s orbit around the Sun is elliptical, with the distance between the perihelion and aphelion points varying throughout the year. The ellipse’s radius is equal to the difference between the perihelion and the aphelion distance. Interestingly, the eccentricity of Earth’s orbit around the Sun is very similar to that of the Moon’s orbit.

In addition to Earth’s elliptical orbit, the sun’s spherical shape is a result of a constant force, called gravitational attraction. The Earth is constantly pulling toward the Sun, but at an extremely high rate of speed, the gravitational effect balances out. The result is a smooth, near-circular motion around the Sun. This motion creates Earth’s ellipse.

The orbit of the Earth around the sun is approximately elliptical and is centered on the Earth-Sun barycenter. Earth’s ellipse orbit has an eccentricity of 0.0167, meaning that it is close to the sun’s center. As the planets circle the Sun, the Earth’s orbit is elliptical as well. This means that Earth spends more time far from the Sun than near the sun, reducing the amount of sunlight received during the year.

Jupiter’s orbit

When it comes to the size and mass of planets in our Solar System, Jupiter stands out. At 2.5 times the mass of all the other planets in our Solar System, Jupiter is the largest. Its mass is also the lightest, with just one-thousandth the mass of the Sun. But how is it different from Earth? What does this mean for humans? Let’s find out. First of all, Jupiter is a gas giant.

Jupiter’s outer atmosphere consists of molecular hydrogen, helium, water, carbon dioxide, methane, and simple molecules. In addition to these elements, the atmosphere contains ice and water clouds. Astronomers believe that there are three types of clouds on Jupiter. One type is composed of ammonia ice, while the other is made of water and ice. Both types are harmless, but some are flammable.

The outer layer of Jupiter is composed mainly of hydrogen and helium. It is ten times the mass of Earth, and it is nearly six percent smaller than the planet’s equatorial surface. Jupiter’s core is likely about 1.5 times the diameter of Earth. Its core resists rotational flattening, resulting in a planet that is twice as dense as the Earth. As a result, Jupiter’s core may contain fourteen to eighteen Earth-masses of heavier elements. As an aside from hydrogen and helium, Jupiter’s core could also contain ice.

Saturn’s orbit

Saturn is the sixth planet from the Sun, and the second-largest gas giant in our Solar System, after Jupiter. The planet is nine and a half times larger than the Earth, has one-eighth the average density of our planet, and is 95 times more massive than the Earth. For more information about Saturn, read our article. Here we’ll explore its orbit around the sun and its size in detail.

Saturn’s rotation period is difficult to measure because it is so small, yet the clouds trace out periods that range from ten hours to ten minutes. Observations of Saturn’s magnetic field show that it is rooted in a metallic-hydrogen outer core, but direct measurement of its rotational axis has been difficult. Because of its high symmetry, researchers aren’t sure what exactly causes the magnetic field to rotate.

While Jupiter’s equatorial escape velocity is 11.2 km per second, Saturn rotates at about eighty-six centimeters per second. Its equatorial gravity cancels out more than 70 percent of the planet’s polar gravity. Because Saturn is so far from the sun, it takes 29.5 Earth years to complete one solar revolution. In fact, Saturn’s day is December 31, and its moon Titan has a unique atmosphere.

Uranus’s orbit

Uranus is the seventh planet from the Sun. It gets its name from the Greek god of the sky, Uranus. The other three gods of the sky were Zeus, Ares, and Cronus. It is the fourth-largest planet in mass and third-largest planetary radius. Its orbit around the Sun is essentially circular. In fact, its orbit around the sun takes only nine days and eight hours.

There are 18 known moons orbiting Uranus, and astronomers believe there are up to three more. Of these, 16 orbit near the equator, while two orbit at an angle to the equator. Seventeen of the 18 confirmed moons are named after Shakespeare characters. Voyager 2, which was launched in 1977, also passed by Neptune, Jupiter, and Saturn. But it was not until 1989 that a spacecraft actually visited Uranus.

The search for Planet X began in the late 19th century. Astronomers had noticed that Uranus’s orbit was being perturbed by something, and they thought that it was the planet Neptune. However, they were mistaken. The undiscovered planet was therefore thought to be a “strange object.”

Pluto’s orbit

The planet Pluto is located in the Kuiper belt, an area beyond Neptune’s orbit. The Kuiper belt has several known objects, but Pluto is the largest. Its orbit around the sun is a bit more complex than that of Neptune’s. Nevertheless, Pluto’s orbit around the sun is still relatively stable. Here is how Pluto’s orbit around the sun works. A Pluto transit will be possible in about 500 years.

While the planet’s surface is more than four billion years old, it has enough heat to be geologically active. Pluto’s rotation in its orbit around the sun causes it to experience seasonal variations in temperature. The result is the polar surface’s climate – a mixture of ice and rock. Depending on where the ice is, this region can have a very distinct atmosphere. But there are other features of Pluto’s surface that are equally fascinating.

Despite its icy surface, Pluto has an atmosphere similar to its surface. Pluto’s volatile ices escape into the atmosphere, which is a reflection of its composition. Unlike Earth, Pluto’s volatile envelope does not contain carbon. Instead, the atmosphere is composed of nitrogen, methane, and carbon monoxide molecules. These gases can only exist because Pluto has no liquid water. Its atmosphere is similar to that of Earth.