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By Marshall Connolly, Catholic Online (NEWS CONSORTIUM) 9/30/2013 Comet appears to glow green with poisonous gas. Well, are you ready? After a year of breathless anticipation, skywatchers are prepared to receive the potential comet of the century next month as Comet ISON sails by Earth one it's first and last trip around the Sun. Comet ISON has a yellow-green tint in this image. Share on email LOS ANGELES, CA (Catholic Online) - Astronomers have been watching Comet ISON closely as it approaches Mars this week, then continues in the general direction of Earth. When it was detected, now just over a year ago, astronomers originally predicted that its close brush with the Sun might cause it to brighten enough to rival the full moon. That prediction has been downgraded as the comet's brightness develops, but there are a number of other surprises that makes ISON worth paying attention to, including its color. Backyard astronomers still have a couple we...