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.
Taking a spin on plasma space tornadoes with NASA...
on November 17, 2017 at 7:17 pm
Tornado-like swirls of space plasma create tumultuous boundaries in the near-Earth environment, letting dangerous high-energy particles slip into near Earth space, new NASA mission results show. […]
Solar minimum surprisingly constant
on November 17, 2017 at 1:58 pm
Using more than half a century of observations, astronomers have discovered that the microwaves coming from the Sun at the minimums of the past five solar cycles have been the same each time, despite large differences in the maximums of the cycles. […]
Pluto's hydrocarbon haze keeps dwarf planet...
on November 15, 2017 at 6:09 pm
The gas composition of a planet's atmosphere generally determines how much heat gets trapped in the atmosphere. For the dwarf planet Pluto, however, the predicted temperature based on the composition of its atmosphere was much higher than actual measurements taken by NASA's New Horizons spacecraft in 2015. A new study proposes a novel cooling mechanism controlled by haze particles to account for Pluto's frigid atmosphere. […]
Dawn spacecraft explores dwarf planet Ceres'...
on November 9, 2017 at 6:57 pm
Surface features on Ceres -- the largest world between Mars and Jupiter -- and its interior evolution have a closer relationship than one might think. A recent study analyzed Ceres' surface features to reveal clues about the dwarf planet's interior evolution. […]
Next Mars rover will have 23 'eyes'
on November 3, 2017 at 4:30 pm
NASA's Mars 2020 mission will have more "eyes" than any rover before it: a grand total of 23, to create sweeping panoramas, reveal obstacles, study the atmosphere, and assist science instruments. They will provide dramatic views during the rover's descent to the Red Planet. […]
Another close-by planetary system?
on November 3, 2017 at 12:18 pm
The ALMA Observatory in Chile has detected dust around the closest star to the Solar System, Proxima Centauri. These new observations reveal the glow coming from cold dust in a region between one to four times as far from Proxima Centauri as the Earth is from the Sun. The data also hint at the presence of an even cooler outer dust belt and may indicate the presence of an elaborate planetary system. […]
Hubble sees nearby asteroids photobombing distant...
on November 2, 2017 at 5:17 pm
Photobombing asteroids from our solar system have snuck their way into this deep image of the universe taken by NASA's Hubble Space Telescope. These asteroids reside roughly 160 million miles from Earth, yet they've horned their way into this picture of thousands of galaxies scattered across space and time at inconceivably farther distances. […]
NASA investigates invisible magnetic bubbles in...
on November 1, 2017 at 7:12 pm
Forty years ago, the twin Voyagers spacecraft were launched to explore the frontiers of our solar system, and have since made countless discoveries, including finding magnetic bubbles around two of the outer planets. […]
Medical-like tools for NASA to study samples of...
on October 31, 2017 at 3:14 pm
A diagnostic tool, similar in theory to those used by the medical profession to noninvasively image internal organs, bones, soft tissue, and blood vessels, could be equally effective at 'triaging' extraterrestrial rocks and other samples before they are shipped to Earth for further analysis. […]
Jupiter's X-ray auroras pulse independently
on October 30, 2017 at 4:34 pm
Jupiter's intense northern and southern lights pulse independently of each other according to new research. […]