Some scientists think that a huge star, much brighter than our sun, exploded near the earth. The star was called a super nova. Dangerous radiation, like x-rays, and intense light caused by the...
Dangerous. Novas, or supernovas. Tycho Brahe coined the phrase "nova stellarum" when a "new star" appeared in the night sky. We now know that he was observing a supernova, the death throes of a very...
This is a guess, because the term is a little vague, but at one time (first half of the twentieth century) there was a theory that planets were "pulled" from their parent star by the gravity of...