Hi everyone, I'm new to this forum, and I've had something going through my mind.<br /><br />Now, there are some things I'm about to write I'm not totally sure, since I've read them in a while and I'm not sure where or how accurate it was.<br /><br />Thing is, Eta Carinae could explode any moment from now, some claim, and, if it were to explode it would create a massive light visible from Earth, even at day. My question is: how long would this "light" be visible? Would it be a few seconds and I could simply lose it because I was home or sleeping, or it would take longer? How much? I know it may not even explode in the next few millenia, but well, I'm quite curious about it.<br /><br />Also, I've read that the last supernova that exploded in our galaxy was about 200-400 years ago? I find that hard to believe, but since I don't know, I must ask. Is this true? When has the last supernova, visible from Earth exploded? If so, there are any historical writings from the people at the time about this event?<br /><br />Thank you in advance, sorry for the burst of questions, some of them may even sound a little silly.