- Jan 13
- 1 min
The Electromagnetic Spectrum
Electromagnetic radiation (EMR) provides all our information about the physical Universe, apart from meteorites and lunar rock samples....
- Jan 6
- 2 min
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, 2023
- 2 min
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, 2023
- 1 min
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, 2023
- 1 min
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, 2023
- 2 min
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, 2023
- 1 min
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...