Yes, this is true. The more massive planets are gaseous. The relatively small inner planets are rocky, which means the are more dense. The gaseous planets make up for there low density with immense size. For example: Jupiter has 1,000 times the volume of Earth, although it is 300 times more massive than the Earth.
The planets that have less mass than Earth are Mercury, Mars and Venus. The planets that have a lower average density than Earth are all of them; Earth is the most dense planet in our solar system.
Jovian planets are more massive and lower in average density. Terrestrial planets are smaller and higher in average density.
The "outer planets" (gas giants Jupiter, Saturn, Uranus, and Neptune) are more massive and spin faster than the inner planets. Although their distance from the Sun means they retained cold outer atmospheres, they would be larger even without these dense gaseous envelopes. The outer planets do not have to move as rapidly in their orbits to counteract the Sun's gravity, as this decreases with the orbital distance. During planetary formation, the protostellar disc would have clumped at the appropriate distance for its velocity. Given this lower speed, and the greater distance traveled, the outer planets take much longer to orbit the Sun than Earth.
The outer planets. The four inner planets (Mercury, Venus, Earth, Mars) are similar to Earth - relatively small, and with a rocky surface. The four outer planets (Jupiter, Saturn, Uranos, Neptune) are gas giants - between 5 and 11 times the diameter of Earth, and made up mainly of gas. They don't have a solid surface you can step on - just gas that gets denser as you go deeper inside.
The giant planets of the outer solar system fall into two categories: gas giants and ice giants. The gas giants, Jupiter and Saturn, are made mostly of hydrogen and helium. The ice giants, Uranus and Neptune, are made mostly of water, ammonia, and methane with hydrogen/helium atmospheres. All of these materials are less dense than rock and metal that make up the smaller inner planets.
Yes. Rock comes and packs together which is what smaller planets are made of. Gas sort of is held together by the core of a planet but still doesn't have enough pressure to hold all the gases tight to the core.
The planets that have less mass than Earth are Mercury, Mars and Venus. The planets that have a lower average density than Earth are all of them; Earth is the most dense planet in our solar system.
Jovian planets are more massive and lower in average density. Terrestrial planets are smaller and higher in average density.
Pluto is colder than any of the planets in our solar system because it is further away from the sun than the planets are. However, Pluto is the second warmest dwarf planet, after Ceres.
Saturn is the least dense of all the Planets. It has been said that if you could find a large enough bath - and water, Saturn would float. This is because Saturn's mean density is lower than water at 0.687 g/cm³
The "outer planets" (gas giants Jupiter, Saturn, Uranus, and Neptune) are more massive and spin faster than the inner planets. Although their distance from the Sun means they retained cold outer atmospheres, they would be larger even without these dense gaseous envelopes. The outer planets do not have to move as rapidly in their orbits to counteract the Sun's gravity, as this decreases with the orbital distance. During planetary formation, the protostellar disc would have clumped at the appropriate distance for its velocity. Given this lower speed, and the greater distance traveled, the outer planets take much longer to orbit the Sun than Earth.
Saturn, Uranus, Jupiter, and Neptune have the lowest densities. Generally, the gas and ice giants have the lowest densities. Saturn has the lowest density of 0.687 g/cm³ which is less dense than water, whereas Neptune has a density of 1.638 g/cm³ The Earth for comparison has a density of 5.515 g/cm3
The Solar System. In capital letters like this, the phrase refers to OUR solar system, back before we knew that planets are apparently quite common. The term "solar system" in lower case can refer to the system of planets and solid bodies orbiting any other star.
Lower temperature air is more dense.
The outer planets. The four inner planets (Mercury, Venus, Earth, Mars) are similar to Earth - relatively small, and with a rocky surface. The four outer planets (Jupiter, Saturn, Uranos, Neptune) are gas giants - between 5 and 11 times the diameter of Earth, and made up mainly of gas. They don't have a solid surface you can step on - just gas that gets denser as you go deeper inside.
The giant planets of the outer solar system fall into two categories: gas giants and ice giants. The gas giants, Jupiter and Saturn, are made mostly of hydrogen and helium. The ice giants, Uranus and Neptune, are made mostly of water, ammonia, and methane with hydrogen/helium atmospheres. All of these materials are less dense than rock and metal that make up the smaller inner planets.
Two main reasons. Firstly, the inner planets are a lot less massive, so their overall gravitational pull is lower than the larger gas planets. Secondly, there is, or has not been, as much material closer to the sun. As a result, the inner planets have captured fewer moons between them. These tend to be the cause of the rings in the outer planets, where orbiting bodies can break up and scatter around the planet in discs.