How do We Know that the Milky Way Galaxy is Spiral in Shape?
A brief description of the observational evidence we have supporting our assertion that the Milky Way galaxy is spiral in shape.
24 Feb 20221min
What is Meant by the 21 Centimeter Radiation of Hydrogen?
A brief description of the 21 centimeter radiation (light) that the Hydrogen atom emits and the mechanism behind this emission.
4 Feb 20222min
How are Neutron Stars and Pulsars Related?
A brief description of what astronomers mean when they say that "all pulsars are neutron stars but not all neutron stars are pulsars."
18 Dec 20211min
What is a Neutron Star?
A brief description of neutron stars, which are essentially the end state of massive stars some of which become pulsars.
3 Aug 20211min
What is a White Dwarf Star?
A brief description of a white dwarf star, which is the end-state of a star that is less than 8 times the mass of Sun.
28 Juli 20211min
How do We Know the Ages of Stars?
A brief description of how we use the HR Diagram and the main sequence to measure the ages of stars in groups and clusters.
23 Juni 20211min
What is Seeing and the Resolving Power of a Telescope?
A brief description of seeing and the resolving power of a telescope.
18 Juni 20211min
Are Black Holes Cosmic Vacuum Cleaners?
A brief description of the true nature of black holes as highly localized sources of gravity and not cosmic vacuum cleaners.
14 Juni 20211min
