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The largest, Ganymede, is the largest moon in the Solar System and surpasses the planet Mercury in size (though not mass). Callisto is only slightly smaller than Mercury in size; the smaller ones, Io and Europa, are about the size of the Moon. The three inner moons — Io, Europa, and Ganymede — are in a 4:2:1 orbital resonance with
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
Moon landing deniers say there's clear photographic evidence of this, and point out that because there's no breeze on the moon, this must be fake. Apollo 11astronaut Edwin Buzz Aldrin, on the Moon ...
The US has been studying the Moon for decades and in 2019 it started to implement the Commercial Lunar Payload Services (CLPS) program to support the crewed Artemis program, both aimed at scouting and exploiting lunar resources to facilitate a long-term crewed base on the Moon, and depending on the lessons learned, then move on to a crewed ...
It was originally thought they had found a piece of the Moon's primordial crust, but later analysis would show that the rock was only 4.1 ± 0.1 billion years old, which is younger than the Moon itself, and was formed after the Moon's crust solidified. But it was still an extremely old sample, and was from the pre-Imbrian era.
In the early solar system, planets including Earth and various moons were pelted by asteroids and other space debris that carried water and chemicals including organic compounds.
The Moon is comparatively close and was studied by radar soon after the invention of the technique in 1946, [54] mainly precise measurements of its distance and its surface roughness. Other bodies that have been observed by this means include: Mercury – Improved value for the distance from the Earth observed (test of theory of General ...
The lunar gold rush ... the Saturn V rockets that launched the Apollo missions could only carry 50 tons to the moon. "In order to have a sustained economy around the moon, I think we need a heavy ...