Distant comets: driven by carbon monoxide? (some comets may be fueled by carbon monoxide rather than water vapor) From: Science News | Date: September 17, 1994| Author: Cowen, Ron | COPYRIGHT 1994 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

When a comet nears the sun's warming rays, some of the frozen water on its surface turns to gas, whooshing into the vacuum of space. This rushing gas drags with it dust from the comet, creating two familiar features -- a comet's tail and its dusty shroud, or coma. But farther from the sun, where temperatures are too low to convert frozen water directly into vapor (a change of phase known as sublimation), some comets still manage to flaunt a tail or expel a jet of gas and dust.

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