This is a list of two types of planets: standard planets and dwarf planets, in the Solar System. Contact online >>
This is a list of two types of planets: standard planets and dwarf planets, in the Solar System.
Technically, there was never a scientific definition of the term planet before 2006. When the Greeks observed the sky thousands of years ago, they discovered objects that acted differently than stars. These points of light seemed to wander around the sky throughout the year. The term "planet" derives from the Greek word "planets" - wanderer.
In 2006, the International Astronomical Union (IAU) convened a Planet Definition Committee, deliberated, and ultimately reached a consensus on a new definition of a planet which leaves us with the eight planets we today consider to comprise the Solar System (thus the exit of Pluto). That new definition: " A "planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighborhood around its orbit [meaning: ''there are no other bodies in its path that it must sweep up as it goes around the Sun''.]"
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Our solar system is located in the Orion spiral arm of the Milky Way Galaxy and contains eight official planets that orbit counterclockwise around the Sun. The order of the eight official solar system planets from the Sun, starting closest and moving outward is:
In addition to the planets, our solar system also includes dwarf planets, moons, asteroids, comets, and meteoroids.
Our planetary system is the only official solar system in the Universe, but astronomers continue to find thousands of other stars with planets orbiting them in our galaxy.
Without the sun’s gravity, every planet and object in the solar system would drift randomly into space. The Sun provides life-giving light, heat, and energy to Earth.
In this article, I’ll provide useful information about each planet in our solar system, and explain why Pluto is considered a ‘dwarf planet’.
Even though there are only 8 official planets in the solar system, it can be tricky to remember them all in order from the Sun. A popular technique to use a mnemonic, which can be any sentence you want using the first letter of each planet.
Here are a few examples of mnemonics for remembering the planet’s names in order from the Sun. Feel free to create your own sentence that is easy to remember.
There is an ongoing debate about the number of planets in our solar system. The most recent definition of a planet was released in 2006 by the International Astronomical Union (IAU), an organization responsible for classifying astronomical objects.
Not all astronomers and planetary scientists agreed with the definitions, with some seeing them as limiting the number of planets and others finding them incomplete and confusing.
Certain astronomers stressed the importance of considering the context for understanding the solar system’s formation and evolution. One proposed idea suggested defining a planet simply as a space object shaped into a roughly spherical form by gravity.
However, objections were raised regarding the specific degree of roundness needed for qualification and the challenges of accurately determining the shapes of distant objects.
Some argue for including factors like an object’s location and composition in defining a planet, considering its dynamics and orbital stability.
The ongoing debate over planet classification persists amidst our expanding knowledge of the universe, which includes the discovery of numerous exoplanets, potentially including habitable ones within the Milky Way Galaxy, raising questions about the applicability of our current definitions.
Many professionals in the field also criticize the IAU definition of trying to limit the number of planets with the most recent change to the definition, as it was ultimately responsible for Pluto being removed as the ninth planet and re-labeled a dwarf planet.
The IAU currently recognizes five dwarf planets:
Based on the geophysical definition of a planet, there are several satellite and dwarf planets in the solar system, and likely more that haven’t been discovered.
These categories help astronomers and scientists classify and understand the diverse range of celestial bodies found within our solar system and beyond.s)
Terrestrial planets include the four closest planets to the Sun located between the Sun and the asteroid belt; Mercury, Venus, Earth, and Mars. Astronomers who use the geophysical definition of a planet would also include the Moon as a terrestrial planet.
Terrestrial planets are planets with a solid surface, often made up of rock or metals. These types of planets also have few moons, a molten core, and can have surface features like valleys, mountains, and volcanoes.
The solar system encompasses planets, moons, asteroids, comets, and dwarf planets, that orbit around the Sun at its center. The solar system was created about 4.6 billion years ago in a collapsing cloud of gas and dust that eventually flattened into a rotating disk.
The two main regions of the solar system are the inner and outer solar systems. The inner planets orbit relatively close to the Sun and have solid surfaces. The outer solar system is where the gas giants reside.
The solar system is always evolving as celestial bodies interact with each other through gravitational forces. Understanding the solar system helps us better understand Earth’s origins and the formation of other planetary systems throughout the universe.
Let’s take a closer look at each of the 8 largest celestial bodies that orbit the sun, the planets. We’ll start with the closest planet to the sun and work our way out to the distant outer solar system objects.
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