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The first part of this question relies on remembering one key principle which is that for a satellite, or any body orbiting in a circle, centripetal force is provided by gravitational force. The rest ...

For starters, what exactly is Kepler's Third Law?

Kepler's Third Law states that the square of the time period...

Half-life is a term commonly used in radioactivity. It defines the time taken for a radioactive source to halve its activity. A radioactive source will e...

With a problem like this, the key is to split it down into component parts.

We will treat the star as a perfec...

The colour of the sky comes from sunlight scattering off of the air molecules (and to your eyes). Blue light gets scattered more than red light because it has a shorter wavelength, and so the light yo...