Jan 13, 20241 min read
The Electromagnetic Spectrum
Electromagnetic radiation (EMR) provides all our information about the physical Universe, apart from meteorites and lunar rock samples....
Jan 6, 20242 min read
What is the Doppler Effect?
In 1842 Christian Doppler hired a group of musicians to play on an open train carriage as it was moving on the track and he heard a...
Dec 30, 20232 min read
What is Gravity?
Gravity is a universal force. It is one of the four fundamental forces that act on us all the time. The strong force and the weak force...
Dec 29, 20231 min read
What is Stephan's Quintet?
Stephan's Quintet is a group of five galaxies that are observed in the constellation of Pegasus in the autumn sky. They were discovered...
Dec 23, 20231 min read
What is a Variable Star?
A variable star's apparent brightness changes over time as seen from Earth. There are 2 basic types: intrinsic variables whose luminosity...
Dec 16, 20232 min read
What is a Nebula?
The word "nebula" is derived from the Latin word for "clouds". A nebula is a cosmic cloud of gas and dust floating in space. The stars...
Dec 8, 20231 min read
What is a Quasar?
Quasars are the brightest & most distant objects in the known universe. The name quasar comes from "quasi-stellar radio source" & they...