Dec 23, 20231 minWhat 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...
Sep 29, 20234 minHow are stars classified and what are stellar spectra?Stellar classification is usually based on two classification schemes, based on the star's surface temperature (the Harvard system), and...
Sep 24, 20233 minWhat is the Bortle Scale?This is a way of measuring the quality (brightness) of the night sky for a given location and it was created and published in 2001 by...
May 20, 20231 minStar brightnessThe brightness of stars appears to be different, because they give out different amounts of light and they lie at vastly different...