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 of its small size, it has a large surface area for its mass, which means that it is rich in elements other than hydrogen and helium (for example, it is mostly made out of iron). The fact that it gets heated by the sun causes a magnetic field, and studies have shown that it also has a liquid core similar to Earth's.
However, this does not mean that Mercury is important only because it is so small. The fact that it is so close to the sun makes its orbit very elliptical, which allows it to experience extreme temperatures: from 450 degrees F (232 degrees C) at the sun-facing side to -180 degrees F (-292 degrees C) at the nightside. This causes major geological changes to occur on its surface over time.
Furthermore, studies have shown that Mercury has a strong magnetic field, which protects it from many particles thrown out by the sun. This may be one reason why there are no active volcanoes on Mercury, although there might be under the crust that we cannot see because of the pressure.
Another reason may be that there is no air or gas present to create volcanic activity.
So it's up to you to determine whether Mercury or Pluto is the smallest planet in the solar system. Jupiter, on the other hand, is unquestionably the biggest planet... Jupiter is the biggest planet in the solar system.
|Equatorial Circumference||439,264 km|
Mercury is the solar system's smallest planet. (Pluto used to possess the title, but it was demoted to minor planet status.) Although its surface resembles that of our moon, the small planet has a density comparable to that of Earth. It orbits so close to the sun that days on Mercury are only slightly longer than nights.
Pluto shares some characteristics with both planets and with asteroids. It has a relatively large mass compared to other objects in the Kuiper Belt, and it has a dense core surrounded by a less-dense mantle and crust. The central core may be similar to that of Earth's, while the outer shell could be similar to that of the moon. However, the overall composition of Pluto remains uncertain because no spacecraft has yet reached its orbit.
The term "planet" is used to describe objects in orbit around a star which influence their surroundings over geological time scales. Astronomers use three main criteria to define a planet: size, mass, and distance from the star. Smaller objects such as asteroids and comets are called interplanetary particles.
In addition to the nine planets known at the time of writing, several others have been added to the list over time. In 2016, the International Astronomical Union (IAU) announced that an object found using NASA's New Horizons spacecraft constituted a new planet.
Scientists have discovered the tiniest known planet, which is even smaller than Mercury, the smallest planet in our solar system. The discovery was made using a new kind of camera that can see objects as small as 35 microns across.
The planet, called OGLE-2017-BLG-1540Lb, is about 20 times more massive than Earth and it takes 2.6 days to orbit its star every 111.2 hours.
It has been estimated that this planet probably has a hydrogen atmosphere, but no evidence of an iron core has been found. It is likely that there is water ice on the surface.
This planet was detected by the OGLE (Optical Gravitational Lensing Experiment) survey while looking for objects causing gravitational lensing in the area of the Milky Way galaxy where we live. Lens systems like this one magnify distant stars' light from their background galaxies, allowing us to see these galaxies when otherwise they would be too faint for detection.
OGLE-2017-BLG-1540Lb is the first planet found using gravitational lensing.
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.
Mars is about half as big as Earth, and they're both classed as terrestrial planets. That means that they have a strong core, which gives them stability but also makes them heavy. The other four planets in our solar system are called celestial bodies because they don't have enough mass or orbital speed to be classified as stars.
Celestial bodies are divided into two groups: gas giants and terrestrial planets. Gas giants such as Jupiter contain large amounts of gas such as hydrogen and helium; these gases can flow under pressure, forming clouds and making the planets seem larger than they are from distance. Terrestrial planets such as Earth have a solid surface composed of iron and nickel with a rock layer on top.
The first four planets out from our Sun are called major planets because they each weigh more than half a billion pounds (227,000 kg). The remaining nine planets are called minor planets because they less than half a billion pounds (227,000 kg). In fact, the only major planet that isn't a double weight world is Uranus because it's too far away from the Sun for its atmosphere to be heated by it sufficiently.