Comet Flies By Mars Today in Rare Encounter: Watch It Online and Comet Siding Spring Swings by on a Close Approach to Mars

I am reading this article Comet Flies By Mars Today in Rare Encounter: Watch It Online here (http://news.yahoo.com/comet-flies-mars-today-rare-encounter-watch-online-131704060.html). I am reading this article Comet Siding Spring Swings by on a Close Approach to Mars here (http://live.slooh.com/stadium/live/comet-siding-spring-swings-by-on-a-close-approach-to-mars).