Since the cosmic microwave background emits as a black body, we start with the spectral radiance of a black…
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Why Don’t All Objects in the Milky Way Rotate Around the Black Hole at the Center of our Galaxy?
The gravitational force has a distance dependence to it that makes it decrease as you get further away from…

How Can We See Stars in the Night Sky When They Are So Far Away?
Even though the stars that we see in the night sky are all very far away, we can see…

How to Calculate the Orbital Period of a Comet Given its Closest and Furthest Orbital Distance
Given the minimum and maximum distance of the orbit of a comet in an elliptical orbit, you can use…

Is the Speed of Light Changed by Gravity?
The short answer is no, the speed of light that you measure locally is unchanged by gravity. In Einstein’s…

Is There Any Difference Between Astronomy and Astrophysics?
Not in practice. You have probably already found a number of online resources that claim that the research that…