Exoplanets, Planets We often read of discovering exoplanets. How far away from Earth would we be “discovered” by another civilization with our current detection technology?
Human Spaceflight, Robotic Spaceflight, Stars The Real Reality Show: Is Interstellar Travel Really Possible?
Exotic Objects, Stars A white dwarf pulls matter from its binary and explodes in a nova. Yet when the mass hits a certain limit, the star bursts in a type Ia supernova and is destroyed. Why the difference?
Cosmology Is the cosmic microwave background a shell around us? Or are the microwaves everywhere in the universe?
