Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid
These are organized by a classification scheme developed exclusively for Cosma. More…
Solar System : the sun together with the group of celestial bodies that are held by its attraction and revolve around it; also : a similar system centered on another star — Webster
Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly, the moons, two are larger than the smallest planet, Mercury.
The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system’s mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane. All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic. — Wikipedia
Solar System (Eric Weisstein’s World of Astronomy, Wolfram Research)
Planets (Eric Weisstein’s World of Astronomy, Wolfram Research)
David Darling’s Internet Encyclopedia of Science, Encyclopædia Britannica
Encyclopedia of the Solar System
Note: These are 360° Videos — press and hold to explore!
Note: This is a 360° Video — press and hold to explore it!
Solar System (Space Place, NASA)
Solar System Explorer (Space Place, NASA)
NASA Virtual Field Trip: Solar System Math
Our Solar System (Ask an Astronomer, Cornell University)
The Nine Planets Solar System Tour
Solar System (Cosmos4Kids)
Solar System, More than Planets (Cosmos4Kids)
Solar System II| Exploration (Cosmos4Kids)
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Weak spots for Mission to Mars revealed
on February 17, 2019 at 4:58 pm
Researchers are developing a predictive model to help NASA anticipate conflicts and communication breakdowns among crew members and head off problems that could make or break the Mission to Mars. […]
Carbonaceous chondrites provide clues about the...
on February 14, 2019 at 4:56 pm
Researchers have discovered that carbonaceous chondrites, a class of meteorites, incorporated hydrated minerals along with organic material from the protoplanetary disk before the formation of planets. […]
NASA's Opportunity rover mission on Mars comes to...
on February 13, 2019 at 8:00 pm
One of the most successful and enduring feats of interplanetary exploration, NASA's Opportunity rover mission is at an end after almost 15 years exploring the surface of Mars and helping lay the groundwork for NASA's return to the Red Planet. […]
Insulating crust kept cryomagma liquid for...
on February 12, 2019 at 7:41 pm
A recent NASA mission to the dwarf planet Ceres found brilliant, white spots of salts on its surface. New research delved into the factors that influenced the volcanic activity that formed the distinctive spots and that could play a key role in mixing the ingredients for life on other worlds. […]
Earth's magnetic shield booms like a drum when...
on February 12, 2019 at 1:15 pm
The Earth's magnetic shield booms like a drum when it is hit by strong impulses, according to new research. […]
Dynamic atmospheres of Uranus, Neptune
on February 7, 2019 at 4:49 pm
NASA's Hubble Space Telescope has uncovered another mysterious dark storm on Neptune and provided a fresh look at a long-lived storm circling around the north polar region on Uranus. […]
Mars rover Curiosity makes first...
on January 31, 2019 at 7:33 pm
A clever use of non-science engineering data from NASA's Mars rover Curiosity has let a team of researchers to measure the density of rock layers in Gale Crater. […]
Missing-link in planet evolution found
on January 28, 2019 at 4:17 pm
For the first time ever, astronomers have detected a 1.3 km radius body at the edge of the Solar System. Kilometer sized bodies like the one discovered have been predicted to exist for more than 70 years. These objects acted as an important step in the planet formation process between small initial amalgamations of dust and ice and the planets we see today. […]
Environmental protection in outer space?
on January 24, 2019 at 3:53 pm
Should regulations for environmental protection be valid beyond our solar system? Currently, extra-terrestrial forms of life are only deemed worth protecting if they can be scientifically investigated. But what about the numerous, presumably lifeless planets whose oxygen atmospheres open up the possibility of their settlement by terrestrial life forms? […]
Where is Earth's submoon?
on January 23, 2019 at 8:35 pm
Juna Kollmeier and Sean Raymond kicked off an internet firestorm late last year when they posted a draft of their article about submoons on a preprint server. The online conversation obsessed over the best term to describe such phenomena. But nomenclature was not the point of Kollmeier and Raymond's investigation, who set out to define the physical parameters for moons that would be capable of being stably orbited by other, smaller moons. […]