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 News -- ScienceDaily Solar System Planets. Astronomy articles on the eight planets, plus the two dwarf planets, Pluto and Eris. Great pictures of everything in the solar system. Updated daily.
Artificial intelligence, NASA data used to...
on December 14, 2017 at 7:14 pm
Our solar system now is tied for most number of planets around a single star, with the recent discovery of an eighth planet circling Kepler-90, a Sun-like star 2,545 light years from Earth. The planet was discovered in data from NASA's Kepler Space Telescope. […]
Spanning disciplines in the search for life...
on December 13, 2017 at 5:47 pm
Following a gold rush of exoplanet discovery, the next step in the search for life is determining which of the known exoplanets are proper candidates for life -- and for this, a cross-disciplinary approach is essential. […]
Mars mission sheds light on habitability of...
on December 13, 2017 at 5:47 pm
Insights from NASA's Mars Atmosphere and Volatile Evolution, or MAVEN, mission about the loss of the Red Planet's atmosphere can help scientists understand the habitability of rocky planets orbiting other stars. […]
Giant storms cause palpitations in Saturn's...
on December 13, 2017 at 5:00 pm
Immense northern storms on Saturn can disturb atmospheric patterns at the planet's equator, finds the international Cassini mission. […]
Electrical and chemical coupling between Saturn...
on December 12, 2017 at 7:17 pm
A Langmuir probe, flown to Saturn on the Cassini spacecraft, has made exciting discoveries in the atmosphere of the planet. They discovered that there is a strong coupling, both chemically and electrically, between the atmosphere of Saturn and its rings. […]
Mars' atmosphere well protected from the solar...
on December 7, 2017 at 7:05 pm
Despite the absence of a global Earth-like magnetic dipole, the Martian atmosphere is well protected from the effects of the solar wind on ion escape from the planet. New research shows this using measurements from the Swedish particle instrument ASPERA-3 on the Mars Express spacecraft. […]
Clay minerals on Mars may have formed in...
on December 6, 2017 at 6:22 pm
New research suggests that the bulk of clay minerals on Mars could have been formed as the planet's crust cooled and solidified, not by later interactions with water on the surface as has long been assumed. […]
New spin to solving mystery of stellar companions
on December 5, 2017 at 2:15 pm
Scientists are investigating the nature of planetary-mass bodies that orbit stars, finding new clues to their origins. […]
Voyager 1 fires up thrusters after 37 years
on December 2, 2017 at 2:49 pm
A set of thrusters aboard the Voyager 1 spacecraft successfully fired up Wednesday after 37 years without use. Since 2014, engineers have noticed that the thrusters Voyager 1 has been using to orient the spacecraft, called "attitude control thrusters," have been degrading. […]
Earthworms can reproduce in Mars soil simulant
on November 27, 2017 at 2:15 pm
Two young worms are the first offspring in a Mars soil experiment. A biologist found them in a Mars soil simulant that he obtained from NASA. At the start he only added adult worms. The experiments are crucial in the study that aims to determine whether people can keep themselves alive at the red planet by growing their own crops on Mars soils. […]