Mercury

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General

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Solar System Exploration: Mercury (NASA)
Mercury Portal (Wikipedia)

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Mercury : the planet nearest the sun — Webster

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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 (Eric Weisstein’s World of Astronomy, Wolfram Research)
Encyclopædia Britannica

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Spacecraft Crashes into Mercury at Insane Speed (Nadia Drake, National Geographic)
Messenger’s final image before crashing into the surface of Mercury (Michelle Starr, CNET)

MESSENGER Mission (NASA)
MESSENGER Mission (NASA)

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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.


Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • For newborn planets, solar systems are naturally...
    on October 10, 2019 at 2:11 pm

    Numerical simulations by a group of astronomers, led by Mario Flock from the Max Planck Institute for Astronomy, have shown that young planetary systems are naturally "baby-proof": Physical mechanisms combine to keep young planets in the inner regions from taking a fatal plunge into the star. Similar processes also allow planets to be born close to stars—from pebbles trapped in a region close to the star. The research, which has been published in the journal Astronomy & Astrophysics, […]

  • The mass inflow and outflow rates of the Milky Way
    on October 4, 2019 at 1:18 pm

    According to the most widely accepted cosmological models, the first galaxies began to form between 13 and 14 billion years ago. Over the course of the next billion years, the cosmic structures now observed first emerged. These include things like galaxy clusters, superclusters and filaments, but also galactic features like globular clusters, galactic bulges, and supermassive black holes (SMBHs).

  • Restoring forests 1 tree at a time, to help...
    on October 1, 2019 at 4:00 am

    Destruction of the forests can be swift. Regrowth is much, much slower.

  • Controlling methane is a fast and critical way to...
    on September 20, 2019 at 11:40 am

    In independent studies, two Princeton University research teams recently identified surprisingly large sources of methane, a powerful greenhouse gas, being leaked into the atmosphere. Pound for pound, methane causes a far greater warming effect in the atmosphere than does carbon dioxide—86-fold more heating over 20 years, and 35-fold more over the course of a century.

  • Venus takes center stage in October 2020...
    on September 20, 2019 at 11:12 am

    Next October, Venus will be the focus of an international campaign of coordinated observations involving two space agencies, three missions and multiple ground-based telescopes and planetary scientists around the world. The collaboration aims to shed new light on the thick and complex atmosphere of Venus. Plans for the campaign and a call for astronomers to participate have been announced today by Dr. Yeon Joo Lee of TU Berlin and Dr. Valeria Mangano of INAF-IAPS at the EPSC-DPS Joint Meeting […]