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  2. Venus - Wikipedia

    en.wikipedia.org/wiki/Venus

    Venus is one of two planets in the Solar System, the other being Mercury, that have no moons. [23] Conditions perhaps favourable for life on Venus have been identified at its cloud layers. Venus may have had liquid surface water early in its history with a habitable environment , [ 24 ] [ 25 ] before a runaway greenhouse effect evaporated any ...

  3. List of natural satellites - Wikipedia

    en.wikipedia.org/wiki/List_of_natural_satellites

    Mercury, the smallest and innermost planet, has no moons, or at least none that can be detected to a diameter of 1.6 km (1.0 mi). [2] For a very short time in 1974, Mercury was thought to have a moon. Venus also has no moons, [3] though reports of a moon around Venus have circulated since the 17th century.

  4. Neith (hypothetical moon) - Wikipedia

    en.wikipedia.org/wiki/Neith_(hypothetical_moon)

    Neith is a hypothetical natural satellite of Venus reportedly sighted by Giovanni Cassini in 1672 and by several other astronomers in following years. It was 'observed' up to 30 times by astronomers until 1770, when there were no new sightings and it was not found during the transit of Venus in 1761 and 1769. [1] [2]

  5. Natural satellite - Wikipedia

    en.wikipedia.org/wiki/Natural_satellite

    Of the inner planets, Mercury and Venus have no natural satellites; Earth has one large natural satellite, known as the Moon; and Mars has two tiny natural satellites, Phobos and Deimos. The giant planets have extensive systems of natural satellites, including half a dozen comparable in size to Earth's Moon: the four Galilean moons , Saturn's ...

  6. Portal:Solar System - Wikipedia

    en.wikipedia.org/wiki/Portal:Solar_System

    Venus is one of two planets in the Solar System, the other being Mercury, that have no moons. Conditions perhaps favourable for life on Venus have been identified at its cloud layers. Venus may have had liquid surface water early in its history with a habitable environment , before a runaway greenhouse effect evaporated any water and turned ...

  7. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    Venus has no natural satellites. [97] Earth (0.98–1.02 AU) [D 6] is the only place in the universe where life and surface liquid water are known to exist. [102] Earth's atmosphere contains 78% nitrogen and 21% oxygen, which is the result of the presence of life.

  8. Geology of Venus - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Venus

    The surface of Venus is comparatively flat. When 93% of the topography was mapped by Pioneer Venus Orbiter, scientists found that the total distance from the lowest point to the highest point on the entire surface was about 13 kilometres (8.1 mi), about the same as the vertical distance between the Earth's ocean floor and the higher summits of the Himalayas.

  9. Hypothetical moon of Mercury - Wikipedia

    en.wikipedia.org/wiki/Hypothetical_moon_of_Mercury

    A moon of Mercury was for a short time thought to exist. On March 27, 1974, two days before Mariner 10 made its flyby of Mercury, instruments began registering large amounts of ultraviolet radiation in the vicinity of Mercury that, according to one astronomer, "had no right to be there". [1]

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