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  1. en.wikipedia.org › wiki › Isaac_NewtonIsaac Newton - Wikipedia

    18 hours ago · The question was not whether gravity existed, but whether it extended so far from Earth that it could also be the force holding the Moon to its orbit. Newton showed that if the force decreased as the inverse square of the distance, one could indeed calculate the Moon's orbital period, and get good agreement.

  2. 18 hours ago · Despite being the only moon in the Solar System with a substantial magnetic field, it is the largest Solar System object without a substantial atmosphere. Like Saturn's largest moon Titan, it is larger than the planet Mercury, but has somewhat less surface gravity than Mercury, Io, or the Moon due to its lower density compared to the three. [18]

  3. 18 hours ago · Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi). It orbits 6,000 km (3,700 mi) from the Martian surface, closer to its primary body than any other known natural satellite to a planet. It orbits Mars much faster than Mars rotates and completes an orbit in just 7 hours and 39 minutes.

  4. en.wikipedia.org › wiki › Apollo_10Apollo 10 - Wikipedia

    18 hours ago · Apollo 10 (May 18–26, 1969) was the fourth human spaceflight in the United States' Apollo program and the second to orbit the Moon. NASA, the mission's operator, described it as a "dress rehearsal" for the first Moon landing (Apollo 11, two months later [4]). It was designated an "F" mission, intended to test all spacecraft components and ...

  5. en.wikipedia.org › wiki › PlutoPluto - Wikipedia

    18 hours ago · Its surface gravity is 0.063 g (compared to 1 g for Earth and 0.17 g for the Moon). [3] This gives Pluto an escape velocity of 4,363.2 km per hour / 2,711.167 miles per hour (as compared to Earth's 40,270 km per hour / 25,020 miles per hour).

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  7. en.wikipedia.org › wiki › Rogue_planetRogue planet - Wikipedia

    18 hours ago · This video shows an artist's impression of the free-floating planet CFBDSIR J214947.2-040308.9. A rogue planet, also termed a free-floating planet (FFP) or an isolated planetary-mass object (iPMO), is an interstellar object of planetary mass which is not gravitationally bound to any star or brown dwarf. [1][2][3][4] Rogue planets may originate ...