# What are the planets' sizes, from smallest to largest?

Name the planets in ascending order from smallest to largest as quickly as you can. Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn, and Jupiter are the planets. The mass of the planets increases from lowest to greatest, and Mercury is the lowest, making it the smallest planet in terms of size and mass. Jupiter is the largest, making it the biggest planet in terms of size.

Mercury has a diameter of 3,476 miles or 5,524 km. It orbits the Sun every 87.905 days. Its mass is roughly that of our Moon - but it weighs less than Earth's Moon because it is so much more sparsely distributed inside out.

Mars has a diameter of 6,400 miles or 10,000 km. It orbits the Sun every 224.924 days. Its mass is about one-third that of Earth - but it weighs less than Earth because it is so much more sparsely distributed inside out.

Venus has a diameter of 7,758 miles or 12,104 km. It orbits the Sun every 225.204 days. Its mass is almost equal to Earth's - but it weighs less than Earth because it is so much more sparsely distributed inside out.

Earth has a diameter of 7,756 miles or 12,174 km. It orbits the Sun once every 24 hours. Its mass is 5.98 billion tons. This makes it by far the most massive object in the Solar System.

## What is the correct order of planets from shortest to longest?

Simply think of anything along the lines of "Mercury Met Venus Every Night Until Saturn Jumped" to keep the list entrenched. This essentially means that the planets' sizes, from smallest to greatest, are Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn, and Jupiter. (Note: Neptune and Uranus were not known to possess moons until later studies revealed they had ones almost as large as Earth's.)

Now, this isn't exactly the only method used by scientists to determine the planet order, but it is one of the most commonly employed methods. The premise behind using this method is that the closer a planet is to its star, the hotter it becomes. Thus, the smaller planets would have been destroyed by the heat before any significant development could have taken place, while the larger worlds might still be geologically active today.

The idea for this method came about in 1838 when Johann Galle discovered that his observations of Mercury were not consistent with Newton's laws on gravity. He proposed an alternative model where Mercury had a small but dense body which caused it to move around its parent star in a very close orbit. Because of this close proximity to the sun, much of Mercury is too hot for life as we know it, so we will not discuss it further here.

Galle's findings were later confirmed by other astronomers who also found evidence of other planets moving around their stars in close-in orbits.

## What are the smaller planets?

Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury would be listed in order of size, from largest to smallest: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury. Since the loss of Pluto as an official planet, Mercury seems to be the smallest planet in the solar system. However, because Pluto was so much smaller than the others, this distinction is purely technical.

In fact, based on their relative sizes, scientists have classified the planets into three groups: the major planets (or terrestrial planets), the ice planets (or frozen worlds), and the rock planets (or metallic worlds).

The term "major planet" describes those planets that are large enough for their own gravity to draw water off of their surfaces and into their interiors, thereby forming atmospheres. The other bodies in the Solar System are too small to do this naturally-the gravity of such small planets isn't strong enough. So they either have no atmosphere or they have one made up entirely of gases such as hydrogen or helium.

Earth's atmosphere is 50 times more dense than space is, so we can say that it weighs down on Earth's surface. Without this atmosphere, the surface gravity of our planet would be only 1/6 of what it is today. This means that if humans were not protected by our atmosphere, we would all die within a few hours due to lack of oxygen.

##### Pamela Greene

Pamela Greene is a freelance writer and blogger who enjoys writing about astrology, dreams, horoscopes, meditation and the occult. She's been studying these subjects for over 4 years now and has a small following on social media platforms. Pam loves to travel as she believes that it helps her connect with herself more deeply.

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