| |
| | Deep Space 1 |
 | | Similar systems have been used for station-keeping by some satellites for a number of years, but the DS 1 ion drive is larger, more efficient, and has worked longer than any previously flown. |
 | | It proved a valuable fix: on Sep. 22, 2001, DS 1 flew past Borrelly's nucleus at a distance of only 2,200 km, snapping 30 or so superb fl and white photos and collecting data on gases and dust around the comet. |
 | | "Deep Space 1 plunged into the heart of Comet Borrelly and has lived to tell every detail of its spine-tingling adventure," said project manager Dr Marc Rayman. |
| www.daviddarling.info /encyclopedia/D/DS1.html (390 words) |
|