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Mercury : the planet nearest the sun — Merriam-Webster   See also   OneLook


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 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 (Encyclopædia Britannica)
Mercury (COSMOS: The SAO Encyclopedia of Astronomy)



Articles about Mercury (Big Think)




Solar System Exploration: Mercury (NASA Science)

Mercury, World of Extremes (Planetary Society)
Mercury (National Air and Space Museum)

Mercury (Eric Weisstein’s World of Astronomy, Wolfram Research)
Mercury (Wolfram Alpha)




Atlas of Mercury: Historical Perspective (NASA History Division)


DDC: 523.41 Mercury (Library Thing)
Subject: Mercury (Library Thing)

Subject: Mercury (Open Library)

LCC: QB 611 Mercury (UPenn Online Books)

LCC: QB 611 Mercury (Library of Congress)

Subject: Mercury (WorldCat)




All About Mercury (Space Place, NASA)
Mercury (Cosmos4Kids)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources



Mercury and Venus Section (British Astronomical Association)


Planet Mercury (JSTOR)
Mercury (Science Daily)
Mercury (
Mercury (Astronomy Magazine)



Planet Mercury (


More News …

Mercury News -- ScienceDaily Planet Mercury News. Read science articles and see images of Mercury.

  • Source of electron acceleration and X-ray aurora...
    on October 10, 2023 at 2:54 pm

    Observations during two flybys by the Mio spacecraft as part of the BepiColombo International Mercury Exploration Project have revealed that chorus waves occur quite locally in the dawn sector of Mercury. Mercury's magnetic field is about 1% of that of Earth, and it was unclear whether chorus waves would be generated like on Earth. The present study reveals that the chorus waves are the driving […]

  • Researchers say space atomic clocks could help...
    on December 5, 2022 at 5:15 pm

    Studying an atomic clock on-board a spacecraft inside the orbit of Mercury and very near to the Sun could be the trick to uncovering the nature of dark matter.

  • Mercury has magnetic storms
    on March 31, 2022 at 2:16 pm

    An international team of scientists has proved that Mercury, our solar system's smallest planet, has geomagnetic storms similar to those on Earth. Their finding, a first, answers the question of whether other planets, including those outside our solar system, can have geomagnetic storms regardless of the size of their magnetosphere or whether they have an Earth-like ionosphere.

  • Why does Mercury have such a big iron core?
    on July 2, 2021 at 7:43 pm

    A new study disputes the prevailing hypothesis on why Mercury has a big core relative to its mantle. For decades, scientists argued that hit-and-run collisions blew away much of Mercury's rocky mantle and left the big, dense, metal core inside. But new research reveals that collisions are not to blame -- instead, the density, mass and iron content of a rocky planet's core is influenced by its […]

  • Cosmic diamonds formed during gigantic planetary...
    on September 29, 2020 at 4:34 pm

    Geoscientists have found the largest extraterrestrial diamonds ever discovered - a few tenths of a millimeter in size nevertheless - inside meteorites. Together with an international team of researchers, they have now been able to prove that these diamonds formed in the early period of our solar system when minor planets collided together or with large asteroids. These new data disprove the […]


Here are links to pages about closely related subjects.

Knowledge Realm


Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.