One good way to prove the existance of Dark Matter is by calculating the mass required of an immense object to exert on other objects that are visible.
For example, it is possible to calculate the mass of a Sun based on the velocity and distance of its orbiting planets. This is simply calculated using the equation below:
compliments of NASA-CHANDRA X-Ray Observatory
G is the gravitional constant
M is the mass of the object exerting gravitational force (i.e Sun or Galaxy)
r is the radius of the planet from the star
v is the velocity of the planet around the star
By simply solving for M we get M=rv2/G.
This means we can calculate the Mass (of Sun or Galaxy) that is required to achieve the velocity of objects that we see at a radius r.
This simple tool can be used in the same way to determine the Mass of a galaxy required to achieve the velocity of stars around its center.
Astronomers apply this equation to galaxies and use the velocities of stars at the outer edges (v) at a radius (r) to determine the Mass required to achieve these observations.
When astronomers use this equation for galaxies, they come up with a Mass that is significantly LARGER than the existing galaxy, and not just a bit larger, they get a mass of approximately 100X LARGER.
This is extremely puzzling and suggests there is a mass present which does not absorb, reflect or interact with any type of light that astronomers currently use (visible, x-ray, gamma ray, infra-red, radio, micro-wave etc) and therefore cannot be seen.
While it cannot be seen, its gravitational effects on observable objects can be calculated and that's how astronomers know it's there.
Dark matter is estimated to represent about 25% of all mass in the universe while everything visible represents only about 5%. Dark energy represents about 70% of the universe.
It is only through solving the great mystery of dark matter and energy that humans will come to understand the true universe.
Maddalena Environmental Inc.
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