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Mars : planet fourth from the sun and conspicuous for its red color — Webster   See also   OneLook


Mars is the fourth planet from the Sun in the Solar System. Named after the Roman god of war, Mars, it is often described as the “Red Planet” as the iron oxide prevalent on its surface gives it a reddish appearance. Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts, and polar ice caps of Earth. The rotational period and seasonal cycles of Mars are likewise similar to those of Earth, as is the tilt that produces the seasons. Mars is the site of Olympus Mons, the highest known mountain within the Solar System, and of Valles Marineris, the largest canyon. — Wikipedia

Mars (Encyclopædia Britannica)




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Mars 2020 Rover (NASA Jet Propulsion Laboratory, YouTube Playlist)
Perseverance Mars Rover Mission (NASA)
Perseverance Rover / Ingenuity Helicopter (Mars 2020, NASA)
Perseverance (Planetary Society)
Perseverance Rover (Wikipedia)

Ingenuity: Mars Helicopter (NASA)
Ingenuity Mission (JPL, NASA)
Ingenuity Helicopter (Wikipedia)

Mars Resources (Staci L. Tiedeken, NASA’s Goddard Space Flight Center)
Mars Exploration Program (NASA)
Mars Missions (NASA)
Mars (JPL, NASA)

Mars (NASA Jet Propulsion Laboratory, YouTube Playlist)
The Mars Report (NASA Jet Propulsion Laboratory, YouTube Playlist)
Mars in a Minute (NASA Jet Propulsion Laboratory, YouTube Playlist)

Mars, the Red Planet (Planetary Society)
Mars (National Air and Space Museum)

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



Mars Campaigns (Kickstarter)
Mars Campaigns (Indiegogo)


Mars Gifts (Zazzle)




Early records of Mars’ observation date back to the ancient Egyptian astronomers in the 2nd millennium BCE. Chinese records about the motions of Mars appeared before the founding of the Zhou Dynasty (1045 BCE). Observations of the position of Mars were made by Babylonian astronomers who developed arithmetic techniques to predict the future position of the planet. The ancient Greek philosophers and Hellenistic astronomers developed a geocentric model of the planet’s motions. Measurements of Mars’ angular diameter can be found in ancient Greek and Indian texts. In the 16th century, Nicolaus Copernicus proposed a heliocentric model for the Solar System in which the planets follow circular orbits about the Sun. This was revised by Johannes Kepler, yielding an elliptic orbit for Mars that more accurately fitted the observational data. The first telescopic observation of Mars was by Galileo Galilei in 1610. — Wikipedia

World Science Festival (YouTube Channel)

A Chronology of Mars Exploration (NASA History Division)
Mars Exploration Past Missions (NASA)
Exploration of Mars (Wikipedia)


Library of Congress # QB641 Mars (UPenn Online Books)

WorldCat, Library of Congress, UPenn Online Books, Open Library




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

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


The Mars Society
Planetary Society
Lunar & Planetary Institute


Mars (Astronomy Magazine)
Mars (Science Daily)
Mars (
Mars (NPR Archives)


Mars (ISBNdb)



Mars (




NASA Movie Trailer Parodies (YouTube Playlist)

Mars (Tim Hunkin, The Rudiments of Wisdom Encyclopedia)


More News …

Mars News -- ScienceDaily Planet Mars News. Read astronomy articles on how Mars could have once supported life, the Mars Rover and more. See images and read full-text articles on Mars exploration.

  • New evidence for liquid water beneath the south...
    on September 29, 2022 at 5:25 pm

    An international team of researchers has revealed new evidence for the possible existence of liquid water beneath the south polar ice cap of Mars.

  • Layering, not liquid: Astronomers explain Mars'...
    on September 27, 2022 at 12:08 am

    Astronomers believe bright reflections beneath the surface of Mars' South Pole are not necessarily evidence of liquid water, but instead geological layers.

  • Newly formed craters located on Mars
    on September 21, 2022 at 3:31 pm

    An international team of researchers with NASA's InSight mission located four new craters created by impacts on the surface of Mars. Using data from a seismometer and visuals acquired from the Mars Reconnaissance Orbiter, the team successfully calculated and confirmed the impact locations. Researchers have now captured the dynamics of an impact on Mars.

  • Geologist proposes the number of ancient Martian...
    on September 19, 2022 at 2:31 pm

    Though Mars is a frozen desert today, scientists have shown that Mars contains evidence of ancient lakes that existed billions of years ago, which could contain evidence for ancient life and climate conditions on the red planet. Through a meta-analysis of years of satellite data that shows evidence for lakes on Mars, a geologist has proposed that scientists might have dramatically underestimated the number of ancient Martian lakes that once existed.

  • NASA's Perseverance rover investigates...
    on September 16, 2022 at 7:37 pm

    NASA's Perseverance rover is well into its second science campaign, collecting rock-core samples from features within an area long considered by scientists to be a top prospect for finding signs of ancient microbial life on Mars.



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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

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