Our Universe
Planets
MercuryMercury is the smallest planet in the Solar System and the one closest to the Sun, with an orbital period of about 88 Earth days, which is much faster than any other planet in the Solar System
Radius: 1,516 mi Mass: 3.285 × 10^23 kg Distance from Sun: 35.98 million mi Length of day: 58 days 15 hours 30 minutes Orbital period: 88 days Gravity: 3.7 m/s² JupiterJupiter is the fifth planet from the Sun and the largest in the Solar System. It is a giant planet with a mass one-thousandth that of the Sun, but two and a half times that of all the other planets in the Solar System combined.
Radius: 43,441 mi Mass: 1.898 × 10^27 kg Distance from Sun: 483.8 million mi Orbital period: 12 years Length of day: 9 hours 56 minutes Moons: Europa, Ganymede, Io, Callisto, Amalthea, Ananke, ect. |
VenusVenus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has the longest rotation period of any planet in the Solar System, and, unusually, rotates in the opposite direction to most other planets. It has no natural satellite
Distance from Sun: 67.24 million mi Radius: 3,760 mi Mass: 4.867 × 10^24 kg Density: 5.24 g/cm³ Age: 4.503 billion years Length of day: 116 days 18 hours SaturnSaturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth.
Distance from Sun: 890.7 million mi Radius: 36,184 mi Mass: 5.683 × 10^26 kg (95.16 M⊕) Density: 687 kg/m³ Surface area: 16.49 billion mi² Moons: Titan, Enceladus, Rhea, Dione, Mimas, Iapetus, Tethys, etc. |
EarthEarth is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life
Radius: 3,959 mi Mass: 5.972 × 10^24 kg Distance from Sun: 92.96 million mi Age: 4.543 billion years Population: 7.125 billion (2013) World Bank Moon: Moon UranusUranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have different bulk chemical composition from that of the larger gas giants Jupiter and Saturn.
Distance from Sun: 1.787 billion mi Density: 1.27 g/cm³ Orbital period: 84 years Radius: 15,759 mi Orbits: Sun Moons: Miranda, Titania, Oberon, Umbriel, Ariel, Puck, Cupid, Mab, etc. |
MarsMars is the fourth planet from the Sun and the second smallest planet in the Solar System, after Mercury. Named after the Roman god of war, it is often referred to as the "Red Planet" because the iron oxide prevalent on its surface gives it a reddish appearance. Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the valleys, deserts, and polar ice caps of Earth.
Radius: 2,106 mi Mass: 6.39 × 10^23 kg Distance from Sun: 141.6 million mi Length of day: 1 day 40 minutes Gravity: 3.711 m/s² Moons: Phobos, Deimos NeptuneNeptune is the eighth and farthest known planet from the Sun. It is the fourth-largest planet by diameter and the third-largest by mass. Among the giant planets in the Solar System, Neptune is the most dense
Distance from Sun: 2.795 billion mi Density: 1.64 g/cm³ Radius: 15,299 mi Mass: 1.024 × 10^26 kg Orbital period: 165 years Moons: Triton, Nereid, Larissa, Naiad, Proteus, Thalassa, Galatea,Despina, Psamathe, Laomedeia, Neso, Halimede, Sao, S/2004 N 1 |
Pluto.... Planet or Not?
Pluto is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune. It was the first Kuiper belt object to be discovered.
This group decided that Pluto was not really a planet because of its size and location in space. So Pluto and objects like it are now called dwarf planets. Pluto is also called a plutoid. A plutoid is a dwarf planet that is farther out in space than the planet Neptune. |
Nebular Hypothesis
Photos used under Creative Commons from marc.spooner1, eschipul, Kevin M. Gill, NASA Goddard Photo and Video, Kevin M. Gill, DLR_de, Kevin M. Gill