moon : a natural satellite of a planet — Webster
Natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called its primary. The two terms are used synonymously for non-artificial satellites of planets, of dwarf planets, and of minor planets. Of the inner planets, Mercury and Venus have no moons; Earth has one large moon, known as the Moon; and Mars has two tiny moons, Phobos and Deimos. The large gas giants have extensive systems of moons, including half a dozen comparable in size to Earth’s moon: the four Galilean moons, Saturn’s Titan, and Neptune’s Triton. Saturn has an additional six mid-sized moons massive enough to have achieved hydrostatic equilibrium, and Uranus has five. The Earth-Moon system is unique in that the ratio of the mass of the Moon to the Earth is much greater than any other planet-moon ratio in the Solar System, and the Moon’s orbit with respect to the Sun is always concave. — Wikipedia
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- Tug of sun, moon could be driving plate motions...on January 21, 2022 at 10:57 pm
A study led by geophysicist Anne M. Hofmeister in Arts & Sciences at Washington University in St. Louis proposes that imbalanced forces and torques in the Earth-moon-sun system drive circulation of the whole mantle.
- Consistent asteroid showers rock previous...on January 21, 2022 at 2:35 pm
New Curtin University research has confirmed the frequency of asteroid collisions that formed impact craters on Mars has been consistent over the past 600 million years.
- NASA solar sail mission to chase tiny asteroid...on January 20, 2022 at 9:27 pm
Launching with the Artemis I uncrewed test flight, NASA's shoebox-size Near-Earth Asteroid Scout will chase down what will become the smallest asteroid ever to be visited by a spacecraft. It will get there by unfurling a solar sail to harness solar radiation for propulsion, making this the agency's first deep space mission of its kind.
- Update on Yutu-2 rover findings from far side of...on January 20, 2022 at 2:48 pm
A large team of researchers affiliated with several institutions in China, Germany and Canada has provided an update of findings made by the Yutu-2 rover, which is exploring a crater on the far side of the moon. In their paper published in the journal Science Robotics, the group notes that thus far, they have found that the soil on the far side of the moon has a different texture than that found on the Earth-facing side.
- Historical study of Norwegian archipelago...on January 20, 2022 at 2:41 pm
A team of researchers from the Norwegian Polar Institute, Uppsala University, Princeton University and California Institute of Technology reports that the rate of glacial melt in a Norwegian archipelago, Svalbard, is speeding up as global warming continues unabated. In their paper published in the journal Nature, the group describes a unique method of measuring glacial melting that produced an estimate of the rate of melting in the future. Twila Moon with the University of Colorado has […]
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- Moon’scapes (2/28/2020) - There’s no denying that it’s been a rough week for many Earthlings. On the other hand, it’s been a great week for anyone who spends their time more preoccupied with the Moon than with more earthly concerns. That’s because there’s a treasure trove of news about our lunar realm. For example, NASA’s Goddard Media Studios … Continue reading Moon’scapes
- Lunar Landings (7/19/2019) - Saturday, July 20th is the 50th anniversary of the Apollo 11 Moon Landing, and there’s a massive media blitz surrounding the occasion. Pretty much every major news outlet is covering it in some way, and it’s no surprise that NASA is leading the publicity frenzy. On Friday at 1 p.m. (EDT) NASA is broadcasting 50 … Continue reading Lunar Landings
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Here are links to pages about closely related subjects.
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