Back to Article List From the March 2009 issue What is a parsec? Why do scientists use this unit instead of light-years? Robert Garver, Sanford, Florida By Astronomy Staff | Published: March 23, 2009 The parsec is a unit for measuring vast astronomical distances based on the parallax effect.
Science Ask Astro: If gravity is the weakest fundamental force, why is the Sun’s gravity so far-reaching?
Exotic Objects, Galaxies Astronomers detected two major targets with a single telescope – a mysterious signal and its source galaxy
Human Spaceflight, Science Ask Astro: How fast could a ship reach light-speed without crushing its human occupants?
