What is the diameter of the earth’s moon?
September 11, 2021The radius of the moon’s orbit about the Earth is about ##3.6 * 10^8## ##m##. The moon’s period is ##2.3 * 10^6## seconds. What is the centripetal acceleration of the moon?
September 11, 2021The Milky Way Galaxy is nearly 68 trillion times larger than .
A. The mean diameter of the Sun is about 1.392 x 10^6 km.
B. The diameter of the Milky Way is usually considered to be about 100,000 light-years, where 1 light-year = 9.461 x 10^12 km. This makes the diameter of the Milky Way to be about 9.461 x 10^17 km.
Dividing B by A, we get 6.797 x 10^13, (or 67.97 x 10^12), or nearly 68 trillion times.
However, there is evidence that the so-called Monoceros Ring, located more than 65,000 light-years from the center of the galaxy, is actually a part of the Milky Way. This is a ring-like filament of stars wrapping around the Milky Way, rippling above and below the relatively flat galactic plane.
The Milky Way may be 50 percent bigger than thought, which would mean a diameter of 150,000 light-years. In that case, the Milky Way is about 100 trillion times larger than the Sun.
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