11.   More carbon monoxide would mean the comet was born in the colder gas cloud that preceded the disk.

12.   The Keck telescope is powerful enough to allow Wolfe and his colleagues to observe how these gas clouds move.

13.   They lie off the galactic plane in the Gould Belt, a region filled with gas clouds and massive stars.

14.   This is not a case like two barges colliding in the ship channel, one rupturing another and there being a gas cloud created.

15.   Through amateur telescopes these faint gas clouds appear gray and unexciting.

16.   Gas clouds were billowing from second-floor windows moments later.

17.   Gas clouds billowed from second floor windows moments later.

18.   Some of the first targets were to be supernovas, the expanding gas clouds created by exploding stars.

19.   Stars form from huge gas clouds that are set into rotation as material nudged by the force of gravity falls at increasing speeds into the center.

20.   Using these signals, scientists can create computer pictures of distant galaxies and interstellar gas clouds that are invisible to optical telescopes.