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Why are Mercury and Venus called inferior planets?

Author

David Ramirez

Updated on March 10, 2026

Why are Mercury and Venus called inferior planets?

Mercury and Venus are referred to as inferior planets, not because they are any less important, but because their orbits are closer to the sun than is Earth's orbit. They always appear close to the sun in Earth's morning or evening sky; their apparent angle from the sun is called elongation.

Besides, why is Mercury and Venus inferior?

The orbits of both Mercury and Venus are closer to the sun than the orbit of the Earth. We call them inferior planets. The closer a planet's orbit is to the sun, the shorter its orbital period.

One may also ask, what are the inferior and superior planets give the name of these planets? In the reference frame of the Earth, in which the terms were originally used, the inferior planets are Mercury and Venus, while the superior planets are Mars, Jupiter, Saturn, Uranus and Neptune.

Additionally, are Mercury and Venus inferior planets?

Mercury and Venus are both known as inferior planets. Actually, they are the only two inferior planets in the Solar System, but this does not mean that they are some lesser class of celestial body. An inferior planet is one whose orbit lies entirely within Earth's orbit.

What is the difference between an inferior planet and a superior planet?

An inferior planet is one whose orbit lies entirely within Earth's orbit. A superior planet is so-called because its orbit lies beyond Earth's. These two distinctions have a major bearing on the planets in our Solar System, and how we observe them.

What are the 2 inferior planets?

Mercury and Venus are both known as inferior planets. Actually, they are the only two inferior planets in the Solar System, but this does not mean that they are some lesser class of celestial body.

Is a Jovian planet?

Jupiter, Saturn, Uranus and Neptune collectively make up the group known as the jovian planets. The general structures of the jovian planets are opposite those of the terrestrial planets. Made almost entirely of hydrogen and helium, these planets do not have solid surfaces.

Why do inferior planets have phases?

Lunar phases happen because of the location and angle of the moon in orbit interacting with that of Earth. The shadow of the planet occludes the surface of the moon. Some planets go through phases as visible from Earth because of the interaction of light from the sun and the planet's own shadow.

What is the best time to view an inferior planet?

Inferior planets orbit the Sun faster than the Earth, and experience inferior conjunctions and superior conjunctions, but never oppositions. The best time for observing an inferior planet is when it is at its greatest elongation from the Sun.

Is Earth a superior planet?

The superior planets are those planets which are further from the Sun than the Earth, namely Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. The superior planets exhibit retrograde motion during their orbits around the Sun. See also: inferior planet.

Why can't we see the surface of Venus?

It portrays Venus if it were terraformed to become a more Earth-like world, with a similar amount of water to Earth. Venus is covered with dense clouds. So we can't see its surface.

How many superior planets are there?

five planets

What is the synodic period of Mercury?

116 days

At which point is an inferior planet closest to Earth in space?

Venus

Which position is the best viewing position for inferior planets?

greatest elongation

Which is the largest and most massive of the planets in our solar system?

Jupiter

What are inferior conjunctions?

An inferior conjunction occurs when a Solar System body lies along a straight line between the Earth and the Sun. At this point, the elongation is zero degrees, and the body will have the same right ascension on the celestial sphere as the Sun.

Which planets can we see without a telescope?

In their outward order from the sun, the five bright planets are Mercury, Venus, Mars, Jupiter and Saturn. These are the planets easily visible without an optical aid. They're the planets watched by our ancestors since time immemorial. These planets do appear bright in our sky.

What does conjunction mean in astronomy?

In astronomy, a conjunction occurs when any two astronomical objects (such as asteroids, moons, planets, and stars) appear to be close together in the sky, as observed from Earth.

What is the solar nebula cloud?

Solar nebula, gaseous cloud from which, in the so-called nebular hypothesis of the origin of the solar system, the Sun and planets formed by condensation. Swedish philosopher Emanuel Swedenborg in 1734 proposed that the planets formed out of a nebular crust that had surrounded the Sun and then broken apart.

Which planet can sustain life?

Earth

What are the 3 categories of planets?

Solar System classification schemes
In our own solar system, astronomers typically distinguish between "rocky" planets and "gas" planets. The rocky planets are Mercury, Venus, Earth and Mars.

Which planet is nearest to Sun?

Mercury

Why Mars is called Red planet?

The planet is about half the size of Earth. A year on Mars is 687 Earth days. Mars is known as the Red Planet. It is red because the soil looks like rusty iron.

What are planets identity?

Since 2004, the IAU has defined a planet by three criteria: it must orbit the sun, be large enough to be shaped into a spherical object by gravity, and clear the neighborhood of its orbit (meaning that there are no objects of comparable size and mass around it).

What is Earth eccentricity?

Eccentricity measures how much the shape of Earth's orbit departs from a perfect circle. These variations affect the distance between Earth and the Sun.

What is the most ringed planet?

Saturn: Facts About the Ringed Planet. Saturn is the sixth planet from the sun and the second-largest planet in the solar system. It's the farthest planet from Earth that's visible to the naked human eye, but the planet's most outstanding features — its rings — are better viewed through a telescope.

How are planets divided?

Planets are generally divided into two groups: the terrestrial and the giant planets. The terrestrial planets are the four inner planets: Mercury, Venus, Earth, and Mars. The giant planets are the next four: Jupiter, Saturn, Uranus, and Neptune. These four are the largest planets in the Solar System.

Which planet is hottest in our solar system?

Planetary surface temperatures tend to get colder the farther a planet is from the Sun. Venus is the exception, as its proximity to the Sun and dense atmosphere make it our solar system's hottest planet.

Which planet is turned on its side with an axis tilt of 98 degrees?

Uranus

What is the greatest elongation of Venus?

Its greatest elongation – farthest apparent distance from the sun in our sky – is March 24. This is Venus' maximum elongation for the year 2020. The planet now resides a whopping 46.1 degrees east of the sun, placing Venus in the western sky after sunset.

What configuration is best to use for observing a superior planet?

The best configuration to observe a planet is when it is at the greatest angular distance from the Sun. This is Greatest Elongation for the inferior planets and Opposition for the superior planets.

Can a superior planet ever be at inferior conjunction?

Meanwhile, the superior planets – or planets farther from the sun than Earth such as Mars, Jupiter, Saturn, Uranus and Neptune – can never be at inferior conjunction. They can never pass between us and the sun.

Which planet can be in inferior conjunction with the sun from an Earth's observer's point of view?

The brightest planet Venus will – on October 26, 2018 – rush between us and the sun. The phenomenon is called the planet's inferior (“lowerâ€) conjunction. It happens each 19 1/2 months (five times in each of the famous Venus 8-year cycles).

Which planet was named after the Roman god of war?

Jupiter, the solar system's biggest planet, was named for the king of the Roman gods, while the reddish color of the planet Mars led the Romans to name it after their god of war.

Why superior conjunction is a poor choice for measuring the synodic period of an inferior planet?

At the Greatest elongation because for both superior and inferior conjunctions it is difficult to see the planet. It is faster when farther away because the planet is able to go around its orbit faster so it takes less time for the synodic period.

What are exterior planets?

From left to right, the outer planets are Jupiter, Saturn, Uranus, and Neptune. The gas giants are made up primarily of hydrogen and helium, the same elements that make up most of the Sun. Astronomers think that hydrogen and helium gases comprised much of the solar system when it first formed.

What are the characteristics of the superior planets?

A superior planet (one with an orbit farther from the Sun than Earth's) is in opposition when Earth passes between it and the Sun. The opposition of a planet is a good time to observe it, because the planet is then at its nearest point to…

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