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…
Mercury : the planet nearest the sun — Webster
Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 87.969 Earth days. The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about its axis for every two orbits. Mercury is bright when viewed from Earth, ranging from −2.3 to 5.7 in apparent magnitude, but is not easily seen as its greatest angular separation from the Sun is only 28.3°. Since Mercury is normally lost in the glare of the Sun, unless there is a solar eclipse it can be viewed from Earth’s Northern Hemisphere only in morning or evening twilight, while its extreme elongations occur in declinations south of the celestial equator, such that it can be seen at favorable apparitions from moderate latitudes in the Southern Hemisphere in a fully dark sky. — Wikipedia
Mercury News -- ScienceDaily Planet Mercury News. Read science articles and see images of Mercury.
Mercury has a solid inner core: New evidence
on April 17, 2019 at 5:00 pm
Scientists have long known that Earth and Mercury have metallic cores. Like Earth, Mercury's outer core is composed of liquid metal, but there have only been hints that Mercury's innermost core is solid. Now, in a new study, scientists report evidence that Mercury's inner core is indeed solid and that it is very nearly the same size as Earth's solid inner core. […]
The true power of the solar wind
on June 12, 2018 at 2:57 pm
The planets and moons of our solar system are continuously being bombarded by particles from the sun. On the Moon or on Mercury, the uppermost layer of rock is gradually eroded by the impact of sun particles. New results show that previous models of this process are incomplete. The effects of solar wind bombardment are much more drastic than previously thought. […]
Mercury's thin, dense crust
on April 27, 2018 at 2:03 pm
A planetary scientist has used careful mathematical calculations to determine the density of Mercury's crust, which is thinner than anyone thought. […]
Meteorite diamonds tell of a lost planet
on April 18, 2018 at 6:48 pm
Scientists have examined a slice from a meteorite that contains large diamonds formed at high pressure. The study shows that the parent body from which the meteorite came was a planetary embryo of a size between Mercury and Mars. […]
Understanding Mercury's magnetic tail
on April 17, 2018 at 3:57 pm
Theoretical physicists used simulations to explain the unusual readings collected in 2009 by the Mercury Surface, Space Environment, Geochemistry, and Ranging mission. The origin of energetic electrons detected in Mercury's magnetic tail has puzzled scientists. This new study provides a possible solution to how these energetic electrons form. […]
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You look but do not find: why the absence of...
on April 23, 2019 at 11:20 am
Imagine you're looking for your keys and you think you might have left them on the bookshelf. But when you look, you see nothing but books. A natural conclusion to draw is that the keys are not there. […]
A closer look at Mercury's spin and gravity...
on April 17, 2019 at 4:22 pm
How do you explore the interior of a planet without ever touching down on it? Start by watching the way the planet spins, then measure how your spacecraft orbits it—very, very carefully. This is exactly what NASA planetary scientists did, using data from the agency's former mission to Mercury. […]
New evidence suggests volcanoes caused biggest...
on April 15, 2019 at 4:41 pm
Researchers say mercury buried in ancient rock provides the strongest evidence yet that volcanoes caused the biggest mass extinction in the history of the Earth. […]
Breezing through the space environment of...
on April 15, 2019 at 11:49 am
The closest exoplanet to us, if we include only single stars like the Sun, is the planet around Barnard's Star, Barnard's Star-b ("BSb"). (The planet Promixa Centauri-b is closer, but Proxima Cen is part of a triple-star system with Alpha and Beta Centauri, and understanding the evolutionary development of the planet is more complicated.) BSb orbits at a distance similar to that of Mercury around the Sun, but Barnard's Star is a cool M-dwarf star and so despite the planet being close to the […]
BepiColombo is ready for its long cruise
on April 5, 2019 at 1:00 pm
Following a series of tests conducted in space over the past five months, the ESA-JAXA BepiColombo mission has successfully completed its near-Earth commissioning phase and is now ready for the operations that will take place during the cruise and, eventually, for its scientific investigations at Mercury. […]