Astronomy-Page: An Astronomy and Space Community

Did you know that there were four dimensions? We are living in a four dimensional world…all the time. And time is the fourth dimension.
It is impossible to imagine a four dimensional space. However we know it exists.
In old theories, space and time were independent from each other. In relativity however time and space cannot be […]

In this section I will be explaining a few basic aspects of light: what is it really? How does it move? What is its speed? What is the use of this speed? Why can’t anything go faster than it?
Light is made up of particles called photons. This name was given to […]

This effect of physics observed by the physicians Doppler and Fizeau have led to major discoveries in the world of science, and especially in astronomy.
Have you ever asked yourself why, when an ambulance passed, the sound seems deeper when it has passed? Or what really is the sound barrier? These are basically applications of the […]

Gravitational mirages are a phenoma that happen at such a large scale that it’s difficult for us humans to imagine them. However we know they exist. This happens in galaxy clusters, which happen to be one of the most massive and large objects known by mankind. On this HST picture figures one of the largest […]