What Is A Planet

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What Is A Planet

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How Long Is A Day On Other Planets?

, “Prodigal”), generally, a relatively large natural body that orbits the Sun or another star and does not release energy from internal nuclear fusion reactions. In addition to the above description, some scientists include additional restrictions on characteristics such as size (for example, the object must be about 1000 km away, or slightly larger than the most famous asteroid, Ceres). shape (it must be large enough to be compressed into a sphere by its own gravity—ie, about 700 km [435 mi] or mass depending on its density (it must have insufficient mass that the core since the term is used to refer to bodies in Earth’s solar system, the International Astronomical Union (IAU), authorized by the scientific community to classify astronomical objects, designates the eight planets that orbit the Sun ; in order of increasing distance, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was also listed as a planet until 2006. Until the end of the 20th century, the only planets were the components of Earth’s solar system At that time, astronomers confirmed that other stars had objects that looked like planets.

The idea of ​​what constitutes a planet in the solar system has traditionally been a product of historical and cultural consensus. Ancient sky watchers used this term

To the seven celestial bodies observed to move appreciably against the background of the visible stars. These include Earth’s Sun and Moon, as well as the five modern-day planets—Mercury, Venus, Mars, Jupiter, and Saturn—that roamed the sky before the invention of the telescope. After the idea of ​​Earth-based space spread (

Some differences were made regarding the Copernican system) and the nature and motion of the heavenly bodies

The Inner And Outer Planets In Our Solar System

Reserved for larger bodies orbiting the Sun. When the giants Uranus and Neptune were discovered in 1781 and 1846, their kinship with other known planets left no doubt that they should join the ranks of the planets. So it was for Pluto, when it was observed as the only object outside Neptune’s orbit in the 1930s in the search for the ninth planet together. In recent decades, Pluto’s planet status has been increasingly questioned by astronomers, who note that its size, unusual orbital characteristics, and composition of ice and rock make it an anomaly among other known planets. . After icy objects the size of Pluto and smaller orbited Neptune in the early 1990s, astronomers realized that Pluto was unique in the Solar System and was certainly one of the largest and closest pieces of debris. , known as the Kuiper Belt, is left over from the formation of planets. (

In August 2006, following a debate over Pluto’s planet status, the IAU General Assembly adopted a definition for a Solar System planet that excludes Pluto. At the same time, Pluto defined a new class of dwarf planets. After the IAU’s announcement, many scientists disputed the concepts, calling them flawed and unscientific and calling for a review.

According to a 2006 IAU decision, for a planet to be in the Solar System, it must meet three conditions: it must be in orbit around the Sun, formed by its gravity into a round or circular shape, and “clear surrounding environment. its orbit,” meaning that its mass must be large enough for its gravity to pull the rocky and icy debris around its orbit. Pluto does not meet the third requirement because it orbits partially inward and is considered part of the Kuiper Belt.

To be a planet under the IAU definition, an object must meet the first two conditions described above; moreover, he must not have purified his surroundings and must not be the moon of another body. Pluto falls into this category, as does the asteroid Ceres and the large Kuiper Belt object Eris, which was discovered outside Pluto’s orbit in 2005. In contrast, Charon is not a dwarf planet because it is a moon of Pluto, although it is more than half the diameter of Pluto. The range of dwarf planets can probably be expanded to fit the definition of known or as yet undiscovered objects.

What Is The Largest Planet Out Of All The Ones We Know?

In June 2008, the IAU created a new category, plutoids, within the category of dwarf planets. The Plutoids are the planets farther from the Sun than Neptune; that is, the largest objects in the Kuiper belt. Both the planets and Eris are plutoids; Because Keres is in the asteroid belt, no.

Of the eight planets currently known in the solar system, the inner four, from Mercury to Mars, are called terrestrial planets; Those from Jupiter to Neptune are called the giant planets or the Jovian planets. Between these two main groups are numerous smaller bodies called asteroids. After the discovery of Ceres and other larger asteroids in the early 19th century, bodies of this class were also called minor planets or planetoids, but the term

Planets and other objects orbiting the Sun are thought to form when part of an interstellar cloud of gas and dust collapses under its gravitational pull, forming a disk-shaped bulge. Further compression of the central region of the disk formed the Sun, while the remaining gas and dust in the surrounding disk in the midplane eventually coalesced into larger objects and eventually the planets. (

Solar System: The Origin of the Solar System.) Astronomers have long wondered whether this planetary process could be associated with the birth of stars other than the Sun. While their parent stars are bright, such small and faint objects will not be easy to distinguish in images taken by near-Earth telescopes. Instead, astronomers have tried to observe them directly through the gravitational effects of their parent stars. After decades of searching for such extrasolar planets, in the early 1990s astronomers discovered three planets orbiting a pulsar called PSR B1257+12 (a rapidly rotating neutron star). The first discovery of a planet orbiting a Sun-like star came in 1995 with the announcement of a large planet orbiting the star 51 Pegasi. In the first 15 years after these initial discoveries, nearly 200 planets orbiting other stars were identified, and in 2005 astronomers took the first direct infrared images of what were interpreted as extrasolar planets. In terms of size, these objects are tens of times more massive than a fraction of the mass of Jupiter. Astronomers need not develop a strict, universally accepted definition of a planet that successfully locates exoplanets and separates them from star-like bodies (eg, brown dwarfs). It started as a cloud of gas and dust. The center of the cloud began to form the Sun. The collision of surrounding material created the eight planets. The inner (rocky or terrestrial) planets are Mercury, Venus, Earth and Mars. The outer planets (or gas giants) are Jupiter, Saturn, Uranus and Neptune.

A Complete Overview Of Our Solar System: Facts

The division of the planets together with their approximate relative sizes, showing their orbits, although not to real scale (below). Image: NASA/JPL

First discovered in the 1930s, Pluto has always been considered the oddity of the solar system. It is much smaller than the planets in our solar system and even smaller than the moon! Pluto does not circle the Sun in the same plane as the eight planets, but its orbit takes it above and below the planets.

The debate over Pluto’s planet status began when astronomers discovered several objects outside Neptune’s orbit. These objects are called “Trans-Neptunian Objects” or TNOs.

In 2005 Eris (formerly known as Xena or 2003 UB313) was discovered. Eris is farther from the Sun than Pluto, and it’s even bigger than Pluto! His discovery raised the question: Eris should be our tenth

Redefining What A Planet Is: Could Pluto Become A Planet Again?

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