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  2. Mercury (planet) - Wikipedia

    en.wikipedia.org/wiki/Mercury_(planet)

    An unusual feature of Mercury's surface is the numerous compression folds, or rupes, that crisscross the plains. These exist on the Moon, but are much more prominent on Mercury. [69] As Mercury's interior cooled, it contracted and its surface began to deform, creating wrinkle ridges and lobate scarps associated with thrust faults.

  3. Apparent retrograde motion - Wikipedia

    en.wikipedia.org/wiki/Apparent_retrograde_motion

    Mercury's elliptical orbit is farther from circular than that of any other planet in the Solar System, resulting in a substantially higher orbital speed near perihelion. As a result, at specific points on Mercury's surface an observer would be able to see the Sun rise part way, then reverse and set before rising again, all within the same ...

  4. Retrograde and prograde motion - Wikipedia

    en.wikipedia.org/wiki/Retrograde_and_prograde_motion

    Despite being closer to the Sun than Venus, Mercury is not tidally locked because it has entered a 3:2 spin–orbit resonance due to the eccentricity of its orbit. Mercury's prograde rotation is slow enough that due to its eccentricity, its angular orbital velocity exceeds its angular rotational velocity near perihelion, causing the motion of ...

  5. Mercury Is in Retrograde Again — Here's What That Means - AOL

    www.aol.com/news/mercury-retrograde-again-heres...

    Mercury is in retrograde for the first time in 2020. Will it cause chaos?

  6. Tests of general relativity - Wikipedia

    en.wikipedia.org/wiki/Tests_of_general_relativity

    the perihelion precession of Mercury's orbit; the deflection of light by the Sun; the gravitational redshift of light; In the letter to The Times (of London) on November 28, 1919, he described the theory of relativity and thanked his English colleagues for their understanding and testing of his work. He also mentioned three classical tests with ...

  7. Mercury could have an 11-mile underground layer of diamonds ...

    www.aol.com/mercury-could-11-mile-underground...

    A mission called BepiColombo — made up of two spacecraft launched in October 2018 — is expected to conduct insertion into Mercury’s orbit in December 2025 after performing a series of flybys ...

  8. Deferent and epicycle - Wikipedia

    en.wikipedia.org/wiki/Deferent_and_epicycle

    Furthermore, if they were scaled so that the Earth's orbit was the same in all of them, the ordering of the planets we recognize today easily followed from the math. Mercury orbited closest to the Sun and the rest of the planets fell into place in order outward, arranged in distance by their periods of revolution. [12]: 54

  9. Mercury's magnetic field is way older than we thought

    www.aol.com/article/2015/05/11/mercurys-magnetic...

    The new data collected by a space probe indicates Mercury's magnetic field could be 3.9 billion years old or some 400 million years older than even Earth's own magnetosphere. In one of its final ...