The terrestrial planets or our solar system: Mercury, Venus, Earth & Mars (Image credit: Public domain) Mercury. It is made mostly of hydrogen and helium. the smallest planet and the nearest to the sun. Most people have at least heard about our solar system and the planets in it. The 4th planet from the sun; also known as the "Red Planet." Our solar system is usually gone over in elementary school, so you might just need a refresher course about the planets in order in our solar system. earth. It contains more than 99.8% of the total mass of the Solar System (Jupiter contains most of the rest). In terms of mass, volume, and surface area, Jupiter is the biggest planet in our Solar System by a wide margin. But just what makes Jupiter so … Jupiter is the biggest planet in the solar system, with four large moons and at least 75 other smaller ones. One year on Jupiter is the same as 11.8 Earth years. Earth is the fourth smallest of the planets—though in terms of the rocky planets, it's the largest—but it's the most dense.Jupiter is the largest planet in the solar system, but it's Saturn—the solar system's second largest planet—that takes the … With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Jupiter is the biggest planet in our solar system. Jupiter is made up of hydrogen and helium, the same materials that build the Sun, from the surface to the core. The planets in order from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and finally the dwarf planet Pluto.. You can't predict a planet's density from its size. Jupiter is a gas giant. Jupiter's Neighbors If you’re fascinated by our solar system, then, you’re in luck. a celestial body that orbits a star, is large enough to be round, and has cleared it's orbital path ... slow rotation, solid surface, no rings, few moons. the largest planet in our solar system. A Planet. Mercury. Jupiter has rings, but they’re very hard to see. Io's surface is covered by sulfur in different colorful forms. From the ringed goddess Saturn, to the lead-melting temperatures of Venus, to the mammoth-sized Jupiter, every planet comes with its own allure and we bet a really good mythological story behind it. It is surrounded by nine continuous rings and three arcs. One day on Jupiter goes by in just 10 hours. The star at the center of our solar system. Time on Jupiter. That's true in the sense that there are many others similar to it. Jupiter has a very thick atmosphere. 3rd planet from sun; has an atmosphere that protects life & surface temp. It is a gaseous planet, but scientists believe that is has a solid core. It is often said that the Sun is an "ordinary" star. 2nd planet from the sun Earth's sister planet Thick carbon dioxide atmosphere traps heat. This is because there are numerous planets to go all around. As Io travels in its slightly elliptical orbit, Jupiter's immense gravity causes "tides" in the solid surface that rise 300 feet (100 meters) high on Io, generating enough heat for volcanic activity and to drive off any water. Saturn is about 9.4 times the size of earth but its density is one-eighth that of our planet. Venus. mars. Io is the most volcanically active body in the solar system. The Sun is by far the largest object in the solar system. 's that allow water to exist as a solid, liquid, & gas. Even though it is a gas giant, its diameter is less than 10% of the Sun’s. Saturn is the second-largest planet in the solar system. 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