Deep-Sky Objects If space is only a few degrees above absolute zero, how can hot nebulae gases from exploded stars stay warm for a long time?
Science Is the universe infinite or finite? Or is it so close to infinite that for all practical purposes it is?
Exoplanets, Planets, Solar System Do the paths of totality during solar eclipses follow a pattern that repeats after a certain period?
Stars What is the baseline for determining the magnitude scale of celestial objects? Why do brighter objects have negative numbers?
