I can not answer these questions myself so I am asking for your help to answer these. 1. In a binary star system ( 2 stars orbiting each other) one of the stars colapsed into a black hole. The black hole begins sucking gas from its sister star. Eventually enough gas is removed from the star and it can no longer sustain a stable core. The srare explodes into a supernova. What happes to the black hole? Does it get oblierated? Or odoes something much stranger happen? 2. A planet once had plant life and bacteria that produced oxygen. The atmosphere had a large ammount of oxygen in it but all the life on the planet died for some mysterious reason. That happened thousands of years ago. Would the atmosphere of the planet still contain a large portion of oxygen? and in techinality be able to support human life? 3. Why is there a "plane" of the universe? What I am asking is why do galaxys seem to be situated in a "flat" plane of refrence and are not likre a globe or sphere? Why are they "flat"? Also why is this with solar systems also? Why do all the planets orbit in the same basic plane?