The Earth has an electric field. On average, this field points vertically downwards and it has a magnitude of about 100 N C-1 (Newtons per Coulomb). It exists because the Earth’s surface carries a negative charge of – 5 x 105 C, while the upper atmosphere carries a compensating positive charge. An average of 400,000 thunderstorms a day sustain a relatively constant electric field.
Black holes are known to exist at the centres of most galaxies, including our own Milky Way. The masses of those black holes are correlated to many of the properties of their host galaxies, which strongly suggests that galaxies and black holes evolve together. Measuring their masses and comparing them in a variety of different galaxies is crucial to the understanding of the interactions between the two components.
14th October 2012. During his ultimate high-altitude parachute jump, Felix Baumgartner spends approximately 4 minutes and 22 seconds in freefall, at the maximum speed of 1,342 kilometres per hour.
Light. Most of us take it for granted during the day. And at night, we have learned to domesticate it. Light, the natural agent that stimulates our sense of sight and makes things around us visible.
Continue reading Let There Be Light…
Avogadro Constant
Bohr Radius
Boltzmann Constant
Charge on an Electron
Gravitational Constant
Magnitude of Acceleration due to Gravity
Permeability of Free Space
Permittivity of Free Space
Speed of Light in a vacuum
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