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  2. Planetary mass - Wikipedia

    en.wikipedia.org/wiki/Planetary_mass

    The choice of solar mass, M β˜‰, as the basic unit for planetary mass comes directly from the calculations used to determine planetary mass.In the most precise case, that of the Earth itself, the mass is known in terms of solar masses to twelve significant figures: the same mass, in terms of kilograms or other Earth-based units, is only known to five significant figures, which is less than a ...

  3. Solar mass - Wikipedia

    en.wikipedia.org/wiki/Solar_mass

    From the value of the diurnal parallax, one can determine the distance to the Sun from the geometry of Earth. [6] [7] The first known estimate of the solar mass was by Isaac Newton. [8] In his work Principia (1687), he estimated that the ratio of the mass of Earth to the Sun was about 1 ⁄ 28 700. Later he determined that his value was based ...

  4. Earth mass - Wikipedia

    en.wikipedia.org/wiki/Earth_mass

    An Earth mass (denoted as M 🜨, M ♁ or M E, where 🜨 and ♁ are the astronomical symbols for Earth), is a unit of mass equal to the mass of the planet Earth. The current best estimate for the mass of Earth is M 🜨 = 5.9722 Γ— 10 24 kg , with a relative uncertainty of 10 βˆ’4 . [ 2 ]

  5. Mass versus weight - Wikipedia

    en.wikipedia.org/wiki/Mass_versus_weight

    The mass of an object is a measure of the object’s inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s 2. In trade and commerce and ...

  6. Astronomical system of units - Wikipedia

    en.wikipedia.org/wiki/Astronomical_system_of_units

    The solar mass (M β˜‰), 1.988 92 Γ— 10 30 kg, is a standard way to express mass in astronomy, used to describe the masses of other stars and galaxies. It is equal to the mass of the Sun, about 333 000 times the mass of the Earth or 1 048 times the mass of Jupiter.

  7. Gravity of Earth - Wikipedia

    en.wikipedia.org/wiki/Gravity_of_Earth

    The weight of an object on Earth's surface is the downwards force on that object, given by Newton's second law of motion, or F = m a (force = mass Γ— acceleration). Gravitational acceleration contributes to the total gravity acceleration, but other factors, such as the rotation of Earth, also contribute, and, therefore, affect the weight of the ...

  8. An unusual object is moving so fast it could escape the Milky ...

    www.aol.com/rare-hypervelocity-star-may-able...

    (The space agency reassigned the mission as the Near-Earth Object Wide-field Infrared Survey ... β€œI calculated the mass of this object to be approximately 8% of the mass of the Sun by comparing ...

  9. Mass - Wikipedia

    en.wikipedia.org/wiki/Mass

    Inertial mass is a measure of an object's resistance to acceleration when a force is applied. It is determined by applying a force to an object and measuring the acceleration that results from that force. An object with small inertial mass will accelerate more than an object with large inertial mass when acted upon by the same force.